|
Detailed Area Plant List for North Hogback Open Space (City of Golden), Jefferson County, United States.
Edited by Tom Schweich
This list is assembled from personal collections, herbarium vouchers, and published lists that were available at the time this list was prepared. There may be additional species of plants in this area that were unknown or undocumented at the time this list was prepared. For California, much of the data is provided by the participants of the Consortium of California Herbaria as indicated by a single dagger “†.” Their web site is at: (http://ucjeps.berkeley.edu/consortium/). For Colorado, much of the data is provided by the Southwest Environmental Information Network as indicated by a double dagger “‡,” which web site is found at (http://swbiodiversity.org). See their respective websites for copyright information and recommended citation formats.
For a complete list of Locations included in this Area List, see the Locations Included section, below. For a check list, please see: Check List for North Hogback Open Space (City of Golden), Jefferson County, United States.
Cupressaceae
Juniperus scopulorum Sarg. (Syn: Sabina scopulorum Sarg.(Sarg.) Rydb. ) Rocky Mountain Juniper. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1735.
6/14/2019.
.
Pinaceae
Pinus scopulorum Lemmon. (Syn: P. ponderosa Laws. var. scopulorum Engelm. ) Rocky Mountain yellow pine. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1734.
6/14/2019.
.
 East slope of Tarryall Mountains from Camp Site 8. |
 Coll. No. 1316, Pinus |
 Rocky Mountain yellow pine on top of North Table Mountain. |
Anacardiaceae
Rhus trilobata Nutt. var. trilobata. (Syn: Rhus aromatica Aiton var. trilobata (Nutt.) A. Gray ex S. Watson ) Skunkbush Sumac. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1722.
6/14/2019.
Mixed foothills grassland and shrubland, shrub density increasing above, also collected here: Celtis reticulata, Gutierrezia sarothrae, Tragia ramosa, Eriogonum alatum, and Grindelia squarrosa.
Variety trilobata if infraspecific names are to be applied.
Northwesternmost city limits of Golden, west side of Dakota Ridge (North Hogback), about 2/3 of the way up the west slope from Cressmans Gulch, 2.66 km. north northwest of the GNIS location of Golden.
Tom Schweich 2401.
29 Jul 2020.
(
COLO2433886‡
UC
)
.
.
Toxicodendron rydbergii (Small ex Rydb.) Greene. Western Poison Ivy. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1740.
6/14/2019.
growing in rock outcrop along the spine of the ridge.
Tom Schweich 2012.
9/17/2020.
.
 Western Poison Ivy on the backbone of Dakota Ridge. |
 Western Poison Ivy (Toxicodendron rydbergii) |
Apiaceae
Lomatium orientale J.M. Coult. & Rose. Salt-and-Pepper. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial, to 20 cm., woody taproot; Leaves, compound, pinnate, 75 mm. × 26 mm. wide, ultimate divisions, ≤3 mm., ≤1 mm. wide, villous, tips, obtuse, (with a very small white “spine”); Inflorescence, compound umbel; Involucel Bracts, glabrous; Flowers, white; Anthers, red; Ovary, glabrous, stylopodium, absent; Fruit, 5 mm. × 3.5 mm. wide, ovate, glabrous, dorsally compressed, lateral ribs winged (Described from Coll. No. 1837, 17 May 2018).
- North Hogback Open Space (City of Golden),
Tom Schweich 1745.
6/14/2019.
Mixed-grass prairie just below foothills mountain mahogany shrubland; collected here: Cerastium arvense, Scutellaria brittonii, Amelanchier alnifolia, nearby: Cercocarpus montanus.
Southern end of the hogback in northernmost Golden, 4.16 km. north northwest of the GNIS location of Golden.
Tom Schweich 2265.1
9 May 2020.
(
CAS
CDA0053728‡
)
.
Asteraceae
Ambrosia psilostachya DC. Western Ragweed. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 40 cm., woody at base; Leaves opposite below, alternate above, 50 mm. × 22 mm., ovate, pinnately divided; Inflorescence indeterminate, appearing raceme-like, 2 kinds of flowers, pistillate heads many, distal, carpellate heads few, clustered in distal leafy axils; Phyllaries fused into a cup; Receptacle not chaffy; Pappus absent (Described from Coll. No. 1068, 8 Oct 2014).
- North Hogback Open Space (City of Golden),
4522.
4/11/2026.
.
.
Artemisia frigida Willd. Prairie Sagewort. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 30 cm., woody at base; Stems many; Leaves alternate, 9 mm., pinnately dissected into 7 parts, silvery hairy; Inflorescence raceme-like, indeterminate, heads 1-3 in axils; Heads have only disk flowers, all alike; Involucre of hairy phyllaries; Phyllaries in 2 series, hairy, not gummy or with tips recurved; Receptacle hairy, not chaffy or bristly; Flowers fertile; Pappus absent; (Described from Coll. No. 1067, 8 Oct 2014).
- North Hogback Open Space (City of Golden),
Tom Schweich 1708.
6/14/2019.
.
.
 Coll. No. 1067, Artemisia frigida |
 Coll. No. 3507, Artemisia frigida. |
 Coll. No. 3625, Artemisia frigida. |
 Coll. No. 1067, Artemisia frigida |
 Coll. No. 1067, Artemisia frigida |
Artemisia ludoviciana Nutt. Silver Wormwood. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1697.
6/14/2019.
.
.
Carduus nutans L. (Syn: Carduus nutans L. ssp. macrolepis (Peterman) Kazmi ) Nodding Plumeless Thistle. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual, to 55 cm., tap-rooted, branched at base; Leaves, basal, withered at flowering, cauline, alternate, decurrent 40 mm. + blade 75 mm. × 25 mm. wide, pinnately lobed, margins spiny; Inflorescence, single heads on spiny tomentose peduncles 2.5-15 cm.; Phyllaries, many graduated series, 9-20 mm. × 1-3 mm. wide, thick at base, mostly green, purplish at margins, mid-vein prominent, tip spiny; Receptacle, alveolate (honeycombed), flat, bristly; Disk flowers, 25 mm., color purple; Pappus, capillary bristles, 18 mm. (Described from Coll. No. 1517, 24 July 2016.)
- North Hogback Open Space (City of Golden),
4266.
7/20/2025.
.
.
 Carduus nutans rosette. |
 Coll. No. 1711, Carduus nutans |
 Coll. No. 2551, Carduus nutans |
Centaurea diffusa Lam. (Syn: Acosta diffusa (Lam.) Soja' k ) Diffuse Knapweed. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
Biennial/Perennial herb, to 50 cm.; Leaves, cauline, alternate, 30 mm. × 12 mm. wide, pinnately lobed, much reduced and entire above, spine-tipped, margins not spiny; Inflorescence, heads borne singly, flowers of one kind; Involucre, 10 mm.; Phyllaries, 4+ series, graduated, 3.5-10.0 mm., all spine tipped, outer and middle with marginal fringe spines; Receptacle, flat, epaleate, bristly; Disk flowers, inner bisexual, Corolla, tube 7.5 mm. + lobes 3 mm., white; Pappus, 0, or very thin ring of scales. Described from Coll. No. 1233, 20 Jul 2015.
- North Hogback Open Space (City of Golden),
Tom Schweich 1719.
6/14/2019.
.
.
 Coll. No. 2676.3, Centaurea diffusa |
 Coll. No. 1233, Centaurea diffusa |
 Coll. No. 1233, Centaurea diffusa |
Cirsium undulatum (Nutt.) Spreng. Wavy Leaved Thistle. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial thistle, to 30 cm., stout tap root; Stem, leafy, 20 cm.; Leaves, basal and cauline, basal, petiole 25 mm. + blade 180 mm. × 55 mm. wide, oblanceolate, pinnately lobed more than half-way to mid-rib, cauline, reduced above, decurrent 5 mm., 45 mm. × 14 mm. wide, lanceolate, surface, adaxial, thinly tomentose, abaxial, tomentose, margins, spiny; Head, 35 mm. × 40 mm. wide, indented around top of peduncle; Phyllaries, many (7?) series, 13 mm. × 3.5 mm. wide, + robust spine 5-6 mm., body dark dorsal ridge, outer and middle reflexed; Flowers, 1 kind; Disk flowers, 25-36 mm., corolla pink-purple; Pappus, plumose bristles; Cypsela, 5 mm., apical collar unremarkable. (Described from Coll. No. 1460, 27 June 2016).
- North Hogback Open Space (City of Golden),
4269.
7/20/2025.
Tom Schweich 1712.
6/14/2019.
.
.
Cirsium vulgare (Savi) Ten. Bull Thistle. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
Leaves, adaxial face with slender appressed bristle-like prickles.
- North Hogback Open Space (City of Golden),
4268.
7/20/2025.
.
.
 Coll. No. 3237, Cirsium vulgare. |
 Coll. No. 3237, basal rosette of Cirsium vulgare. |
 Leaf tip of Cirsium vulgare, Coll. No. 1035 |
Erigeron divergens Torr. & A. Gray. Spreading Fleabane. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual or short-lived perennial, to 15 cm., tap-rooted, ±spreading hairy throughout, becoming minutely glandular above, hairs multicellular with clear crosswalls; Leaves, basal, absent or withered; cauline, alternate, petiole ±10 mm. + blade ±12 mm. × 2.4 mm. wide, uniformly hairy, somewhat reduced above; Inflorescence, heads borne singly on leafy stems, peduncles spreading or decurved, but cannot be described as “heads nodding;” Involucre, 3 mm. × limb 12 mm.; Receptacle, epaleate; Flowers, 2 kinds; Rays, corolla, 3.5 mm., white fading blue; Disk flowers, corolla, 1.7 mm., yellow; Pappus, short scales and longer capillary bristles, similar on ray and disk flowers; Cypsela, 0.8 mm. (Described from Coll. No. 1489. 13 July 2016. See also Coll. No. 3381).
- North Hogback Open Space (City of Golden),
Tom Schweich 1692.
6/14/2019.
.
.
Gaillardia aristata Pursh. Blanketflower. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 40 cm.; Leaves, alternate, entire to toothed; Inflorescence, single heads on peduncles 13-18 cm., flowers of 2 kinds; Phyllaries, 2+ series, 17 mm. × 2.7 mm. wide, lance-linear; Receptacle, epaleate, setae, to 10 mm.; Rays, sterile, corolla, 21 mm. × 10 mm. wide, yellow, deeply 3-lobed; Disk flowers, corolla, 7 mm., purple; Pappus of 6+ aristate scales, 4 mm., awn 2×> body. Described from Coll. No. 1205, 12 Jul 2015.
- North Hogback Open Space (City of Golden),
Foothills shrubland, mostly Cercocarpus montanus; also collected here: Hypericum perforatum; nearby: Campanula rotundifolia, and Muhlenbergia montana.
Hogback at the northern city limits of Golden, nearly to the top of the west slopes. 4.40 km. north northwest of the GNIS location of Golden.
Tom Schweich 2356.
12 Jun 2020.
(
UC
)
.
.
 Gaillardia aristata on Dakota Ridge. |
 Coll. No. 1665, Gaillardia aristata |
 Flowerhead of Coll. No. 1454, Gaillardia aristata |
Grindelia squarrosa (Pursh) Dunal. Curlycup Gumweed. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Foothills grassland, below any significant concentration of shrubs, also collected here: Rhus trilobata, Tragia ramosa, Eriogonum alatum, and Gutierrezia sarothrae.
Northwesternmost city limits of Golden, west side of Dakota Ridge (North Hogback), about 1/2 of the way up the west slope from Cressmans Gulch, 2.66 km. north northwest of the GNIS location of Golden.
Tom Schweich 2399.
29 Jul 2020.
(
CS198700‡
EIU
)
.
.
 Obs. No. 4391, Grindelia squarrosa. |
 Obs. No. 4391, Grindelia squarrosa. |
 Obs. No. 4391, Grindelia squarrosa. |
 Grindelia squarrosa in my garden. |
Grindelia subalpina Greene. Subalpine Gumweed. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, 45-60 cm.; Stem, light brown, glabrous; Leaves, cauline, alternate, sessile, blade 45 mm. × 12 mm. wide, reduced distally, oblanceolate, adaxially glandular, margins, dentate, teeth separated 3-5 mm., apiculate; Inflorescence, heads, #3-4 per stem, not overtopped by leaves, showy, gummy exudate; Involucre, 10 mm. × 13 mm. wide, globose, resinous; Phyllaries, in 5± unequal graduated series, lower << rest of involucre, upper 8 mm. × 1.3 mm. wide, resinous, margins, flat, tips, acuminate, lower coiled 360°; Pappus, few, well developed bristles, 3.5 mm, readily falling; Style, 2-branched, stigmatic portion 0.6 mm. + appendages 0.6 mm.; Cypsela, 1.6 mm. × 0.6 mm. wide, black, glabrous. (Described from Coll. No. 3530, 18 September 2025.)
- North Hogback Open Space (City of Golden),
4525.
4/11/2026.
.
.
 Obs. No. 4396, Grindelia subalpina. |
 Obs. No. 4392, Grindelia subalpina in DeLong Park. |
 Coll. No. 3530, Grindelia subalpina. |
Gutierrezia sarothrae (Pursh) Britton & Rusby. (Syn: G. linearifolia Lag. ) Broom Snakeweed. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial, tap-rooted, to 9 cm.; Leaves, alternate, linear, 20 mm. × 1 mm. mm. wide, dotted with embedded oil glands, very few short hairs; Peduncle, 0.5-1.5 mm.; Inflorescence, some flowers with strap-shaped corollas, flowers of two kinds in same heads, Involucre, 3.5 mm. × 2.5-3.0 mm. wide, obconic, not gummy; Phyllary, 2-3 unequal series, inner folded around ovary of ray flowers, dotted with embedded oil glands, tips appressed; Receptacle, epaleate; Rays, #5, yellow; Disk, #4; Pappus, a well-developed crown of scales on both ray and disk flowers; (Described from Coll. No. 144, 3 Oct 1997: keys easily to Gutierrezia sarothrae. However, inner phyllaries are folded around ovary of ray flowers, a character not mentioned in keys or description.)
- North Hogback Open Space (City of Golden),
Tom Schweich 1713.
6/14/2019.
Foothills grassland, below any significant concentration of shrubs, also collected here: Rhus trilobata, Tragia ramosa, Eriogonum alatum, and Grindelia squarrosa.
Northwesternmost city limits of Golden, west side of Dakota Ridge (North Hogback), about 1/2 of the way up the west slope from Cressmans Gulch, 2.66 km. north northwest of the GNIS location of Golden.
Tom Schweich 2400.
29 Jul 2020.
(
CAS1087035‡
CDA0053768‡
UCR297629‡
)
.
.
Helianthus pumilus Nutt. Little Sunflower. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 40 cm.; Leaves, cauline, alternate, occasionally opposite, then bases conjoined, simple, petiole 7-10 mm. + blade 55-86 mm. × 22-30 mm. wide, lanceolate, flat (not folded), margin, entire to lightly toothed, adaxial, pustular strigose, hairs multicellular, crosswalls clear, abaxial, glandular and strigose; Inflorescence, heads single to few on leafy stems, peduncles to 8-10 cm., hairy, glandular; Involucre, 9 mm. × 16 mm. wide; Phyllaries in 2+ series, similar, 6-10 mm. × 2.0-3.5(4) mm. wide, greene erect, ovate, strigose abaxially, margins ciliate, tip acuminate, not as “stiff” or “tough” as those of Coll. No. 1199; Receptacle, slightly convex, paleate; Disk, 17 mm. wide; Palea, 9 mm., tip, glandular, hairy distally; Flowers, 2 kinds; Ray flowers, sterile, #10-12, corolla, 17-25 mm. × (4)6-9 mm. wide, yellow; Disk flowers, corolla, 4-6 mm., yellow, lobes, #5, 1 mm., yellow, anther appendages reddish-brown; Pappus of few long (2.5-4 mm.) aristate scales; Cypsela, 3.5 mm. × 1.4 mm. wide, quadrangular,not laterally compressed black. Described from Coll. No. 1210, 1426, and 1704.
- North Hogback Open Space (City of Golden),
Tom Schweich 1720.
6/14/2019.
Also collected here: Bromus japonicus, and Nassella viridula, and nearby: Hypericum perforatum, Potentilla recta, and Muhlenbergia montana.
Hogback at the northern city limits of Golden, 3/4 of the way up the west-facing slope, at the lower edge of Cercocarpus montanus, 4.41 km. north northwest of the GNIS location of Golden.
Tom Schweich 2354.
12 Jun 2020.
(
CDA0053752‡
OBI149319‡
REGIS
)
.
.
 Coll. No. 1704, Helianthus pumilus |
 Coll. No. 1426, Helianthus pumilis |
Heterotheca villosa (Pursh) Shinners. (Syn: H. v. (Pursh) Shinners var. nana (A. Gray) Semple , H. v. (Pursh) Shinners var. villosa ) Hairy False Goldenaster. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 50 cm.; Leaves, cauline alternate, entire, 1-veined, distal perpendicular to stems, hairs > glands; Heads solitary, with both ray and disk flowers; Phyllaries in 2+ series, unequal, to 7 mm.; Rays, 9 mm.; Pappus double, outer narrow scales ≤ 1 mm. (easier to see on mature fruit), inner bristles, 6.5 mm., white; Fruit, disk 3 mm., hairy.
- North Hogback Open Space (City of Golden),
Open herbaceous vegetation, ponderosa pines and mountain mahogany shrubland nearby. Also collected here: Koeleria macrantha, Hesperostipa comata, and Eriogonum umbellatum var. umbellatum.
Hogback at the northern city limits of Golden, dry and more or less flat area on top of ridge, 4.38 km. north northwest of the GNIS location of Golden.
Tom Schweich 2358.
12 Jun 2020.
(
COLO2434165‡
REGIS
)
.
.
Hymenopappus filifolius Hook. var. polycephalus (Osterh.) B.L. Turner. Many-Headed Fine-Leaved Wooly-White. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 60 cm., ±tomentose throughout; Leaves, basal, petiole 35 mm. + blade 75-105 mm. × 30-50 mm. wide, oblanceolate in shape, base conspicuously tomentose, bipinnately dissected to filiform segments, ultimate leaf divisions (8)12-19 mm., cauline, similar, reduced above, #(4)5-8; Inflorescence, heads borne singly on peduncles, 22-45 mm.; Heads, (5)7-16 per stem; Involucre, 8 mm. × 15 mm. wide; Phyllaries, 1-2 series (vague what is a series and what not), 6-7 mm. × 2.5-4.0 mm. wide, inner > outer, green, tomentose, margins chartaceous, tips broad; Receptacle, epaleate, flat; Flowers, 1 kind; Disk flowers, corollas, 3.5 mm., yellow; Pappus, crown of scales, 0.8-1.2 mm.; Cypsela, 3-5 mm., hairy all over, more so on the angles. (Described from Coll. No. 1427, 15 June 2016, and Coll. No. 1504, 13 July 2016.)
- North Hogback Open Space (City of Golden),
Tom Schweich 1717.
6/14/2019.
.
.
Liatris punctata Hook. Dotted Blazing Star. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 32 cm.; Leaves, cauline, alternate, 78 mm. × 3.5 mm. wide, gradually reduced above, linear, glandular punctate, margins, entire, revolute, sparsely hairy; Inflorescence, single heads in axils on short pedicels; Involucre, 16 mm. × 7 mm. wide, ±cylindrical; Phyllaries, in 2+ series, inbricate, 14 mm. × 3.8 mm. wide, glandular-punctate abaxially distally, margin, ciliate, scarious, tip acute; Receptacle, epaleate; Flowers, one kind; Disk flowers; Corolla, tube white 8 mm. + lobes purple 2.5 mm.; Pappus, bristles, one series, 10 mm., plumose; Cypsela, 7 mm., hairy. Described from Coll. No. 1264, 29 Jul 2015.
- North Hogback Open Space (City of Golden),
Foothills grassland with a few Rhus trilobata. Cercocarpus montanus higher up the slope. Also collected here: Cerastium arvense, Scutellaria brittonii, Castilleja integra, and Alyssum simplex.
Northwesternmost city limits of Golden, west side of Dakota Ridge (North Hogback), about half way up the slope above Cressmans Gulch, 2.60 km. north northwest of the GNIS location of Golden.
Tom Schweich 2405.
29 Jul 2020.
(
CDA0053770‡
)
.
.
 Coll. No. 1736, Liatris punctata |
 Coll. No. 3195, Liatris punctata. |
 Inflorescence of Coll. No. 1264, Liatris punctata |
 Coll. No. 1264, Liatris punctata |
Nothocalais cuspidata (Pursh) Greene. Prairie False Dandelion. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
About ¼ up the west limb, sparsely vegetated soil; with Rhus trilobata, Yucca glauca, Linum lewisii, Eriogonum alatum, Poa sp., and Euphorbia esula.
Lower western slope of hogback in northernmost Golden, 4.2 km. north northwest of the GNIS location of Golden.
Tom Schweich 2759.
26 Apr 2022.
(
CS
)
.
.
 Nothocalais cuspidata on the Nightbird Gulch Trail |
 Coll. No. 1791, Nothocalais cuspidata |
Onopordum acanthium L. Scotch Cottonthistle. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1700.
6/14/2019.
.
.
 Coll. No. 2772, Onopordum acanthium |
Pseudognaphalium canescens (DC.) Anderberg. (Syn: P. canescens (DC.) W. A. Weber [illeg.] ) Wright's Rabbit-Tobacco. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial, to 25 cm.; Leaves, alternate, petiole 16 mm. + blade 30 mm. × 10 mm. wide, tomentose (slightly less so adaxially), sessile glandular beneath the tomentum; Inflorescence, terminal and axial on leafy stems; Phyllaries, 3 series, 3.7 mm. × 1 mm. wide, green center, mostly scarious, innermost glabrous; Receptacle, epaleate, flat; Flowers, 2 kinds (heads disciform); Rays, small, inconspicuous, sterile; Disk flowers, corolla, 2 mm., yellow; Pappus, capillary bristles, >corollas. (Described from Coll. No. 1549, 1 Sep 2016.)
- North Hogback Open Space (City of Golden),
Top of ridge, east side.
Tom Schweich 1739.
6/14/2019.
Sedimentary rock outcrops and foothills shrubland, also collected nearby: Linaria canadensis var. texana, Physaria montana, and Viola nuttallii.
Northwesternmost city limits of Golden, west side of Dakota Ridge (North Hogback), base of rock outcrop at top of ridge, 2.65 km. north northwest of the GNIS location of Golden.
Tom Schweich 2403.
29 Jul 2020.
(
COLO2433837‡
OBI149099‡
)
.
.
 Coll. No. 1549, Pseudognaphalium canescens |
 Coll. No. 1549, Pseudognaphalium canescens |
Ratibida columnifera (Nutt.) Woot. & Standl. (Syn: Rudbeckia columnifera Nutt. ) Upright Prairie Coneflower. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 50 cm., tap-rooted; Leaves, cauline, to 11 cm. × 3 cm. wide, 1-pinnate, pinnae to 39 mm. × 4 mm. wide, some toothed; Inflorescence, single heads per stem, >> leaves; Involucre, 14 mm. diameter; Phyllaries, 1 series, lanceolate, hairy abaxially; Receptacle, cylindric, paleate; Rays, #5, 17 mm., × 13 mm. wide, elliptic-ovate, sterile, corolla yellow; Disk, cylindric, 20-45 mm. × 9-12 mm. wide; Palea, folded around but not enclosing disk flowers; Disk flowers, many, corolla greenish-yellow; Pappus, short crown of scales; Fruit, compressed, but maybe not strongly, ciliate adaxially(!). Described from Coll. No. 1198, 12 July 2015.
- North Hogback Open Space (City of Golden),
4271.
7/20/2025.
.
.
 Coll. No. 1198, Ratibida columnifera |
 Coll. No. 1496, Ratibida columnifera |
Solidago missouriensis Nutt. Missouri Goldenrod. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 35-40 cm., generally glabrous throughout; Leaves, basal, unknown, cauline, alternate, petiole 10-45 cm. + blade 100 mm. × 21-22 mm. wide, reduced above, oblanceolate, margin, sparsely scabrous proximally, serrate distally, glabrous, prominently 3(5)-nerved; Inflorescence, crowded panicle; Pedicels, 1 mm.; Bracts, #2, 1.8 mm.; Involucre, 3.0-4.5 mm. × 3-5 mm. wide, obconic; Phyllaries, 2+ series, 2.2-3.5 mm. × 1 mm. wide, graduated, green, margin chartaceous, veins 1; Receptacle, epaleate, conic; Flowers, 2 kinds; Rays, #12, fertile, tube 2 mm. + blade 2.2 mm., yellow; Disk flower, #12, tube 2.8 mm. + lobes 0.7 mm. = 3.5 mm., yellow; Pappus, capillary bristles, 3.0 mm.; Cypsela, 0.4-0.6 mm., glabrous-sparsely hairy. Described from Coll. No. 1255, 26 Jul 2015, and Coll. No. 1519, 29 Jul 2016. Distinguished in part by its glabrous characters and presence of 3 prominent nerves on leaves. Jepson eFlora notes that S. missouriensis Nutt. Is misapplied to S. spectabilis (D. C. Eaton) A. Gray. FNANM states that, in the west, it can be similar to smaller plants of S. spectabilis (13 Sep 2014).
- North Hogback Open Space (City of Golden),
4270.
7/20/2025.
With an Opuntia (non-native), Euphorbia esula, Pediomelum tenuiflorum, Rumex crispus, and Bromus inermis.
This parcel designated the North Golden Hogback Open Space in July 2025.
On the lowest stream terrace of a dry wash (Cressman Gulch) that runs along the southwest side of the open space, 3.30 km. northwest of the GNIS location of Golden.
Tom Schweich 3455.
20 Jul 2025.
(
CAS
FLD
OBI
UCR
)
.
.
Thelesperma megapotamicum (Spreng.) Kuntze. Hopi Tea Greenthread. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 55 cm., woody at base, glabrous, eglandular; Leaves, opposite, pinnately lobed, lobes filiform, 30-35 mm.; Inflorescence, 1-3 heads per stem on 10 cm. peduncles; Phyllaries, 2 dimorphic series, without bristles or spines, outer, 2 mm. × 1.3 mm. wide, spreading, inner, 8 mm. × 3 mm. wide, connate 4.7 mm, tips erect; Receptacle, paleate, flat; Paleae, 7 mm. × 2 mm. wide, mid-vein greenish-brown, otherwise chartaceous; Flowers of 1 kind; Disc flowers, corolla, tube 3 mm. + throat 1 mm. + lobes 2 mm., color yellow with red-brown veins; Pappus, 2 retrorsely barbed awns; Cypsela, 3.8 mm. (Described from Coll. No. 1483, 6 Jul 2016.)
- North Hogback Open Space (City of Golden),
With Artemisia frigida, Lupinus argenteus, and Pediomelum tenuiflorum.
This parcel designated the North Golden Hogback Open Space in July 2025.
On an upper stream terrace of a dry wash (Cressman Gulch) that runs along the southwest side of the open space, 3.35 km. northwest of the GNIS location of Golden.
Tom Schweich 3457.
20 Jul 2025.
(
CAS
FLD
UCR
)
.
.
 Tea made from Thelesperma megapotamicum |
 Coll. No. 1707, Thelesperma megapotamicum |
 Coll. No. 1483, Thelesperma megapotamicum |
Tragopogon dubius Scop. (Syn: Tragopogon dubius Scop. ssp. major (Jacq.) Vollman ) Yellow Salsify. CalPhotos. Jepson eFlora. SEINet Taxon.
Peduncle inflated distally, flowers yellow, phyllaries in 1 overlapping series, ligules 3-5 mm. shorter than phyllaries.
- North Hogback Open Space (City of Golden),
Tom Schweich 1703.
6/14/2019.
.
 Coll. No. 1115, Tragopogon dubius |
Boraginaceae
Cryptantha Lehm. ex G. Don. Cryptantha. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 2472.1
25 May 2021.
(
Golden
)
.
.
 Collection No. 535, Cryptantha, at Wimmer Flat on San Rafael Swell, Utah |
 Coll. No. 535, Cryptantha |
Lappula occidentalis (S. Watson) Greene. (Syn: L. occidentalis (S. Watson) Greene var. occidentalis , L. redowskii (Hornem.) Greene , L. redowskii (Hornem.) Greene var. redowskii ) Flatspine Stickseed. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden), Tom Schweich 1721. 6/14/2019. . .
Lithospermum arvense L. (Syn: Buglossoides arvensis (L.) I. M. Johnst. ) Corn Gromwell. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual, to 30 cm., hairs appressed with pustular bases; Stem, some branched distally; Leaves, basal and cauline, basal, petiole 5 mm. + blade 13 mm. × 3.5 mm. wide, slightly obovate, margin entire, hairs as above, withering, cauline, alternate, sessile, 19 mm. × 3.7 mm. wide, margin entire, hairs as above; Calyx, lobes, 5.2 mm. × 0.7 mm. wide, enlarged in fruit to 7 mm., hairs as above; Corolla, tube 4 mm. + throat 1 mm. + lobes 1.5 mm., blue to white, abaxial spreading hairy; Stamens, attached in tube; Style, 1.2 mm., Nutlets, #(1-2) 3 (4), 2.8 mm. × 2 mm. wide, green - tan, tuberculed (Described from Coll. No. 1783 and Coll. No. 1827).
- North Hogback Open Space (City of Golden),
Also collected here: Poa pratensis, Secale cereale, Linum lewisii, and Lupinus argenteus.
Northwesternmost Golden, between Pine Ridge Road and Dakota Ridge, on a terrace above Cressmans Gulch, 4.50 km. north northwest of the GNIS location of Golden.
Tom Schweich 2351.1
12 Jun 2020.
(
Golden
)
Weedy place above the channel of Cressman Gulch, with non-natives Medicago sativa, Euphorbia esula, Verbascum thapsus, Bromus inermis, and natives Linum lewisii, Lupinus argenteus, and Pediomelum tenuiflorum.
Northwest corner of Golden, strath above Cressmans Gulch, 115 m. downstream from Pine Ridge Road, 4.46 km. northwest of the GNIS location of Golden.
Tom Schweich 2473.
25 May 2021.
(
OBI185088‡
)
.
.
 Habitat of Coll. No. 1788, Lithospermum arvense. |
 Habitat of Lithospermum arvense in Kinney Run. |
 Habitat of Coll. No. 1827, Lithospermum arvense |
 Coll. No. 1788, Lithospermum arvense |
Mertensia lanceolata (Pursh) DC. Prairie Bluebells. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, with spreading-ascending branches to 20 cm.; Stem, glabrous; Leaves, basal and cauline, basal, petiole 55 mm. + blade 50 mm. × 12.5 mm. wide, lanceolate, distinct lateral veins, papillate adaxially, margin, entire, appressed ciliate; cauline, sessile, 40 mm. × 4 mm. wide, without distinct lateral veins, papillate to strigose (oriented toward apex) adaxially, margin, entire, appressed ciliate; Inflorescence, panicle; Calyx, not divided to base, tube 1.5 mm. + lobes 2-3 mm.; Corolla, tube 4.0-6.5 mm. + lobes 4.5-7.5 mm., free 2.0 mm., limb 5-10 mm., deciduous, blue, small tufts or a ring of hairs near (2.2 mm.) base of throat; Stamens, #5-6, inserted, attached just below (0.5 mm.) throat/fornices; Filaments, 2.0-3.5 mm., strap-shaped, filaments ≥ anthers; Anthers, 1.8-2.3 mm., versatile, yellow; Ovary, 0.7 mm. × 1.3 mm. wide, partially fused to calyx; Style, 7.0-7.5 mm., single, ±≥anthers; Stigma, simple; Fruit, #4 nutlets, 1.7 mm. × 1.5 mm. wide. (Described from Coll. Nos. 1906 & 2035.)
- North Hogback Open Space (City of Golden),
4520.
4/11/2026.
.
Brassicaceae
Alyssum simplex Rudolphi. (Syn: A. campestre (L.) L. var. simplex (Rudolphi) Willd. , A. minus Rothm. , A. parviflorum Fisch. ex M.Bieb. ) European Madwort. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual, tap-rooted, to 12-30 cm., stellate hairy throughout (typically doubly branched and 8-pointed); Stem branched at base, ascending; Leaves basal, withered at flowering, appear compound, cauline, alternate, 14-28 mm. × 3.5-5.0 mm., oblanceolate, margin entire, tip acute, sessile or vaguely short-petioled; Inflorescence not bracted; Pedicels, in fruit, 4.5 mm.; Sepals, 4, 2 mm. × 0.7 mm. wide, deciduous in fruit; Petals 2.9-3.0 mm., yellow fading white,clawed, entire to tip slightly notched; Stamens, 2.5-2.6 mm.; Filaments, 2.3 mm., winged proximal 1.5-1.8 mm., not toothed; Style persistent, 1.3 mm., few hairs at base; Fruit round, 3.5-5.0 mm. × 5.6 mm. wide, margin entire, compressed parallel to the replum, hairy, hairs thinning as fruit matures; Ovules, 4 (most keys and descriptions say 2 when they give a specific number, but the genus is described as having 1-2[4] ovules). (Described from Clyde Golden, 25 Jun 2011, Coll. No. 1090, 30 Apr 2015, and Coll. No. 1367, 24 May 2016).
- North Hogback Open Space (City of Golden),
Tom Schweich 1696.
6/14/2019.
Grassy southwest facing slope. Also collected here: Erodium cicutarium, Euphorbia esula, and Castilleja integra.
Southern end of the hogback in northernmost Golden, 4.15 km. north northwest of the GNIS location of Golden.
Tom Schweich 2264.
9 May 2020.
(
CDA0053727‡
CS
OBI149324‡
REGIS
)
.
.
 Alyssum simplex |
 Alyssum simplex |
 Fruit of Coll. No. 1090, Alyssum simplex |
 Coll. No. 1090, Alyssum simplex |
 Coll. No. 1367, Alyssum simplex |
Berteroa incana (L.) DC. Hoary Alyssum. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual terrestrial herb, to 50 cm.; Leaves, cauline, elliptical, 20 mm. × 5 mm.; Flowers, not bracteate; Petals, 4, white, deeply bilobed; Style, 1.4 mm. in young fruit; Fruit, elliptical, 7 mm. × 4 mm. wide × 2 mm. thick, flattened parallel to papery internal partition.
- North Hogback Open Space (City of Golden),
This parcel designated the North Golden Hogback Open Space in July 2025.
In the bottom of the dry wash (Cressman Gulch) that runs along the southwest side of the open space, 3.23 km. northwest of the GNIS location of Golden.
Tom Schweich 3453.
20 Jul 2025.
(
FLD
OBI
REGIS
)
.
.
 Habitat of Berteroa incana |
 Coll. No. 1056, Berteroa incana |
Erysimum capitatum (Hook.) Greene. Sanddune Wallflower. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial or at least biennial, 16 cm. 25-45 cm., hairs dolabriform throughout; Root, tap; Stems, erect, leafy, proximal not woody hairs as above; Leaves, basal and cauline, basal, petiole, indistinct, ±10 mm., + blade, 50-100 mm. × 2.5-3 mm. wide, narrowly oblanceolate, margin 1-3 shallowly pinnate dentate, cauline, nearly sessile, 42 mm. × 2.5 mm. wide, ±linear, margin, entire, reduced distally; Inflorescence, raceme 130 mm. × 45 mm. wide, not bracted; Pedicels, 3-6 mm., elongating as flower matures, ascending; Flowers, radial; Sepals, #4, rows, 1, 7 mm. × 1-1.5 mm. wide, narrow and wide pairs opposite, lateral pair basally saccate; Petals, claw, 10-11 mm. + blade 6-9 mm. × 4-6 mm. wide, spoon-shaped, margin, entire, color, yellow, orange; Stamens, #6, 11 & 15 mm., tetradynamous (2 short, 4 long); Anthers, 4.5 mm.; Ovary, 4 mm.; Style, 9 mm.; Stigma, capitate; Fruit, 17-34 mm. × 1 mm. wide, 4-angled, ascending, hairy as above; Seeds, unknown (Described from Coll. Nos. 206, 1835, & 2306).
- North Hogback Open Space (City of Golden),
Amid grasses and forbs; also collected nearby: Rhus trilobata, Delphinium carolinum virescens, Potentilla recta, Thermopsis divaricarpa, Grindelia squarrosa, and Nassella viridula.
Unusually large numbers in bloom here, perhaps a result of the wet Spring.
Mid-slope on the west limb of Dakota Ridge, a hogback in north Golden that structurally related to Dinosaur Ridge in south Golden, 4.38 km. northwest of the GNIS location of Golden.
Tom Schweich 2474.
25 May 2021.
(
OBI185091‡
)
.
.
Physaria montana (A. Gray) Greene. (Syn: Lesquerella montana (A. Gray) S. Watson ) Mountain Bladderpod. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial, rosette to 5 cm. dia., flowering stems to 14 cm., not in alpine environment, eastern slope, hairs stellate throughout; Leaves, basal, rosette, 9 mm. × 6.5 mm., ovate, entire, petiole, 12 mm., cauline, 10 mm., appearing secund, narrowly oblanceolate; Inflorescence, exceeding leaves; Pedicels, in fruit, ascending; Fruit, 5 mm. × 2 mm., ovate-elliptic, hairs stellate, apex entire (not notched, although these immature). (Described from Coll. No. 1081, 23 Apr 2015).
- North Hogback Open Space (City of Golden),
4523.
4/11/2026.
In upturned rocks on the spine of the hogback, also seen or collected here: Eriogonum umbellatum, Penstemon virens, Ribes cereum, Coryphantha vivipara, and Cercocarpus montanus.
Southern end of the hogback in northernmost Golden, 4.19 km. north northwest of the GNIS location of Golden.
Tom Schweich 2271.1
9 May 2020.
(
COLO2433753‡
)
In upturned rocks on the spine of the hogback, also seen or collected here: Eriogonum umbellatum, Penstemon virens, Ribes cereum, Coryphantha vivipara, and Cercocarpus montanus.
Southern end of the hogback in northernmost Golden, 4.21 km. north northwest of the GNIS location of Golden.
Tom Schweich 2272.
9 May 2020.
(
CS
REGIS
)
.
 Coll. No. 2796, Physaria montana. |
 Coll. No. 1081, Physaria montana |
 Inflorescence of Coll. No. 1377, Physaria montana |
 Coll. No. 1377, Physaria montana |
Cactaceae
Escobaria missouriensis (Sweet) D.R.Hunt. (Syn: Coryphantha missouriensis (Sweet) Britton & Rose ) Missouri Foxtail Cactus. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1718.
6/14/2019.
.
.
Escobaria vivipara (Nutt.) Buxb. (Syn: Coryphantha vivipara (Nutt.) Britton & Rose , Escobaria vivipara (Nutt.) Buxb. var. deserti (Engelm.) D. R. Hunt , Escobaria vivipara (Nutt.) Buxb. var. rosea (Clokey) D. R. Hunt ) Beehive Cactus. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
3 large stems
4265.
7/20/2025.
just on the east side of the spine of the ridge.
Tom Schweich 2011.
9/17/2020.
Tom Schweich 2473.
4/26/2022.
.
.
Opuntia macrorhiza Engelm. Western Pricklypear. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial cactus, not distinctly mat-forming; Stem, segments, 90 mm. × 60 mm. wide, flattened, bluish-green, areoles, #5-6 per diagonal row, spaced 8-14 mm., proximal, glochids only, distal, glochids and spines, spines, #2, #1, 28 mm., erect, brown to tan at tip, #1, 12 mm., recumbent, nearly white; Flowers, petals, 36 mm. × 22 mm. wide, wedge-shaped, color yellow; Stamens, many, 18 mm., yellow; Style, 20-24 mm., stout; Stigma, lobes, #6-8, 3 mm.; Fruit, 38 mm. × 17 mm. wide, narrow at base, fleshy, green, areoles, mix of glochids and short spines. (Described from Coll. No. 1948, 15 June 2018.)
- North Hogback Open Space (City of Golden),
Tom Schweich 1706.
6/14/2019.
.
.
 Coll. No. 2371, Opuntia macrorhiza |
 Opuntia macrorhiza on Schweich Hill. |
 Obs. No. 1540, Opuntia macrorhiza |
 Coll. No. 1948, Opuntia macrorhiza |
Opuntia polyacantha Haw. Plains Pricklypear. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
generally seen on the west slope from the spine of the ridge down to about mid-slope.
Tom Schweich 2010.
9/17/2020.
.
.
Pediocactus simpsonii (Engelm.) Britton & Rose. (Syn: Echinocactus simpsonii Engelm. , Pediocactus simpsonii (Engelm.) Britton & Rose var. minor (Engelm.) Cockerell ) Mountain Ball Cactus. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1730.
6/14/2019.
.
Campanulaceae
Campanula rotundifolia L. (=Campanula petiolata A. DC.) Harebell. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 40 cm.; Leaves, basal, ?, cauline, alternate, ±lance-linear, 52 mm. × 2.5 mm. wide; Inflorescence, solitary and loose racemes; Pedicel, 9 mm.; Calyx, tube 2.5 mm. + 5 lobes 2.5 mm. = 5.0 mm.; Corolla, 13 mm, blue-purple; Capsule, nodding, 5.5 mm. × 4.5 mm. wide, opening by pores near the base. Described from Coll. No. 1246, 24 July 2015.
- North Hogback Open Space (City of Golden),
Top of ridge.
Tom Schweich 1738.
6/14/2019.
Tom Schweich 1941.
6/12/2020.
.
 Coll. No. 2151, Campanula rotundifolia |
 Coll. No. 1246, Campanula rotundifolia |
Cannabaceae
Celtis reticulata Torr. (Syn: Celtis laevigata Willd. var. reticulata L. D. Benson ) Net-Leaved Hackberry. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1732.
6/14/2019.
Mixed foothills grassland and shrubland, shrub density increasing above, also collected here: Rhus trilobata, Gutierrezia sarothrae, Tragia ramosa, Eriogonum alatum, and Grindelia squarrosa.
Northwesternmost city limits of Golden, west side of Dakota Ridge (North Hogback), base of a rock outcrop, about 2/3 of the way up the west slope from Cressmans Gulch, 2.67 km. north northwest of the GNIS location of Golden.
Tom Schweich 2402.
29 Jul 2020.
(
COLO2433829‡
OBI149100‡
)
.
Caprifoliaceae
Dipsacus laciniatus L. Cutleaf Teasel. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Also collected here: Chenopodium album and Physalis longifolia.
D. laciniatus is more common in Golden than D. fullonum, both of which are Colorado Noxious Weed List B weeds.
Northwestern-most Golden, in the pit of a former clay mine, accessed by way of the City of Golden Cressman Gulch Trail and then a social/game trail, 4.19 km. north northeast of the GNIS location of Golden.
Tom Schweich 2395.
29 Jul 2020.
(
CDA0053766‡
CS
KHD00072979‡
OBI149337‡
UCR
)
.
 Coll. No. 2412, Dipsacus laciniatus, imaged by COLO. |
Caryophyllaceae
Cerastium arvense L. ssp. strictum Gaudin. (Syn: Cerastium strictum L ) Field Chickweed. CalPhotos. Jepson eFlora. SEINet Taxon.
Common early-flowering perennial, to 20 cm.; Leaves, opposite, broadly linear, 15 mm. × 3 mm. wide, stipules absent, tufts of leaves in lower axils; Sepals free; Petals >> sepals, white, notched; Styles (4)5.
- North Hogback Open Space (City of Golden),
Tom Schweich 1746.
6/14/2019.
Southwest-facing slope, with Artemisia ludoviciana, Linum lewisii, and Grindelia squarrosa.
Southern end of the hogback in northernmost Golden, 4.16 km. north northwest of the GNIS location of Golden.
Tom Schweich 2265.
9 May 2020.
(
OBI149330‡
REGIS
UCR
)
.
Chenopodiaceae
Chenopodium album L. Lambsquarters. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Top of a waste pile. Also collected here or nearby: Dipsacus laciniatus and Physalis longifolia.
Northwestern-most Golden, in the pit of a former clay mine, accessed by way of the City of Golden Cressman Gulch Trail and then a social/game trail, 4.28 km. north northeast of the GNIS location of Golden.
Tom Schweich 2396.1
29 Jul 2020.
(
CAS
CDA0053767‡
COLO2433860‡
UC
)
.
 Coll. No. 1750, Chenopodium album |
 Coll. No. 3203, Chenopodium album. |
 Coll. No. 1750, Chenopodium album |
Convolvulaceae
Convolvulus arvensis L. Field Bindweed. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1728.
6/14/2019.
.
 Habitat of Coll. No. 1220, Convolvulus arvensis |
 Coll. No. 1220, Convolvulus arvensis |
Elaeagnaceae
Elaeagnus angustifolia L. Russian Olive. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1748.
6/14/2019.
.
 Russian Olive (Elaeagnus angustifolia) on the other side of the trail. |
 Coll. No. 1645, Elaeagnus angustifolia |
 Coll. No. 1437, Elaeagnus angustifolia |
Euphorbiaceae
Euphorbia esula L. [misapplied]. (=Euphorbia virgata Engelm.) Leafy Spurge. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1690.
6/14/2019.
Grassy southwest facing slope. Many plants here.
Colorado Noxious Weed List B.
Southern end of the hogback in northernmost Golden, 4.15 km. north northwest of the GNIS location of Golden.
Tom Schweich 2263.
9 May 2020.
(
COLO2433738‡
CS
OBI149328‡
REGIS
)
Weedy place above the channel of Cressman Gulch, with non-natives Medicago sativa, Lithospermum arvense, Verbascum thapsus, Bromus inermis, and natives Linum lewisii, Lupinus argenteus, and Pediomelum tenuiflorum.
Plants are growing in plastic mesh suggesting this area was subjected to revegetation in the past. Colorado Noxious Weed List B.
Northwest corner of Golden, strath above Cressmans Gulch, 115 m. downstream from Pine Ridge Road, 4.46 km. northwest of the GNIS location of Golden.
Tom Schweich 2473.1
25 May 2021.
(
COLO2706471‡
KHD00075611‡
)
.
.
 Habitat of Coll. No. 1795, Euphorbia esula |
 Coll. No. 1657, Euphorbia esula |
 Coll. No. 1733, Euphorbia esula |
 Coll. No. 2473.1, Euphorbia esula |
Tragia ramosa Torr. Branched Noseburn. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden), Tom Schweich 1729. 6/14/2019. Tom Schweich 1985. 7/29/2020. .
Fabaceae
Astragalus drummondii Dougl. ex Hook. Drummond's Milkvetch. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 35 cm., caulescent; Stem, rachis, abaxial leaf surfaces, and calyx spreading hairy, hairs basifixed; Leaves, cauline, compound, odd-pinnate, stipules, 9 mm., free, entire, leaflets, 23-27, 19 mm. × 5.5 mm. wide, wavy hairy abaxially and marginally, ±glabrous adaxially; Calyx, tube 6 mm. + lobes 3 mm. = 9 mm., green at base to cream color at tube and lobes, few dark wavy hairs, persistent; Corolla, 17 mm., color cream, banner, 17 mm., wings, claw 6 mm. + blade 9 mm., tip obtuse, keel, 14 mm., tip purple, Ovary, 9 mm.; Style, 4 mm., glabrous, persistent; Fruit, stalked 12 mm. + body 26 mm. × 4 mm. wide, pendant, smooth, glabrous, not inflated. Described from Coll. No. 1141, 9 Jun 2015.
- North Hogback Open Space (City of Golden),
Tom Schweich 1714.
6/14/2019.
.
.
 Coll. No. 1141, Astragalus drummondii |
 Flower of Coll. No. 1141, Astragalus drummondii |
 Fruit of Coll. No. 1141, Astragalus drummondii |
 Inflorescence of Coll. No. 1141, Astragalus drummondii |
Astragalus shortianus [Nutt. ex] Torr. & A.Gray. Short's Milkvetch. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 10 cm., acaulescent; Leaves, compound, petiole, 50 mm., blade, 90 mm. × 37 mm. wide, leaflets, #13, 17 mm. × 10 mm. wide, terminal leaflet not a tendril, petiole, rachis, and leaflets with appressed stiff straight hairs; Inflorescence, not an umbel; Calyx, tube 6 mm. + lobes 4 mm., hairs similar; Flower, zygomorphic, banner 22 mm., wings 18 mm., clawed, keel, 22 mm., tip obtuse; Fruit, 35 mm. × 10 mm. wide, falcate, appressed stiff basifixed straight hairs (Described from Coll. No. 1826, 16 May 2018).
- North Hogback Open Space (City of Golden),
Tom Schweich 2478.
4/26/2022.
.
.
 Coll. No. 1405, fragments of an Astragalus, maybe A. shortianus |
 Pieces of Coll. No. 1826, Astragalus shortianus |
Colutea arborescens L. Bladder Senna. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial shrub, to 2 m., woody below; Stem erect, unarmed; Leaves compound, odd-pinnate (with terminal leaflet); Leaflets, 11, 16 mm. × 12 mm. wide, notched at tip, glabrous above, sparsely appressed hairy below; Inflorescence a raceme, axillary, 9± flowers; Calyx, 5-merous, 5 mm. × 6 mm. dia., appressed hairy; Flowers, 19 mm., yellow, with dark markings; Banner, 10 mm.; Wings, 10 mm. × 4 mm., reduced in comparison to Lupinus; Keel, fully enclosing stamens and pistil, glabrous; Stamens, 10; Filaments, 9 fused, 1 free; Style, recurved; Fruit, inflated, bladder-like, 50 mm. × 22 mm., walls papery, color reddish fading to brown, base stalk-like; Seeds, reniform, flattened, 6 mm. × 4 mm. × 2 mm., brown, surface smooth; native to southern Europe (Described from Coll. No. 1066, 6 Oct 2014).
- North Hogback Open Space (City of Golden),
Many plants in and around the surge basin north of Wyoming Street at Ridge Road, 2.3 km north northwest of the GNIS location of Golden.
Tom Schweich 1066.
6 Oct 2014.
(
UC2045776‡
UCR266093‡
)
.
.
Lupinus argenteus Pursh var. argenteus. Loosely Flowered Silver Lupine. CalPhotos. Jepson eFlora. SEINet Taxon.
Characters observed while keying: Perennial > 1 dm, stem hairs appressed, leaves cauline, petioles 4-4.5mm, calyx spurred <= 1 mm, banner back hairy, keel upper margin ciliate distal half. Most of the Lupinus argenteus in Golden are var. argenteus.
- North Hogback Open Space (City of Golden),
var. argenteus assumed.
Tom Schweich 1695.
6/14/2019.
Also collected here: Poa pratensis, Secale cereale, Linum lewisii, and Lithospermum arvense.
Northwesternmost Golden, between Pine Ridge Road and Dakota Ridge, on a southwest-facing bank of Cressmans Gulch, 4.42 km. north northwest of the GNIS location of Golden.
Tom Schweich 2352.
12 Jun 2020.
(
COLO2434140‡
OBI149352‡
REGIS
UCR297618‡
)
.
.
Melilotus officinalis (L.) Lam. Yellow Sweet Clover. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Grassy bank of gulch, also seen or collected here: Rumex acetosella, Linum lewisii, Lupinus argenteus, and Thelesperma megapotamicum.
Northwesternmost Golden, between Pine Ridge Road and Dakota Ridge, on a southwest-facing bank of Cressmans Gulch, 4.42 km. north northwest of the GNIS location of Golden.
Tom Schweich 2360.
12 Jun 2020.
(
CS
)
.
.
 Inflorescence of Coll. No. 1687, Melilotus officinalis |
Oxytropis lambertii Pursh. Purple Locoweed. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, acaulescent, mostly dolabriform hairs (one arm much shorter than the other); Leaves, basal, pinnately compound, leaflets #17, terminal leaflet present; Inflorescence, raceme, peduncle 30 cm., pedicels very short; Bracts, 7 mm. × 1.6 mm. wide, green, lanceolate; Calyx, tube 7 mm. + lobes 4 mm. = 11 mm.; Flower, zygomorphic, various shades of magenta to purple, banner, 17 mm., wings, 16 mm., keel, 13 mm., blades united enclosing stamens, recurved beak; Stamens, #10, diadelphous (Described from Coll. No. 1385, 1 June 2016).
- North Hogback Open Space (City of Golden),
Tom Schweich 1707.
6/14/2019.
.
.
 Purple Locoweed (Oxytropis lambertii) on top of North Table Mountain. |
 Coll. No. 1385, Oxytropis lambertii |
 Coll. No. 3415, Oxytropis lambertii. |
Pediomelum tenuiflorum (Pursh) A. N. Egan. (Syn: Psoralea tenuiflora Pursh , Psoralidium tenuiflorum (Pursh) Rydb. ) Slimflower Scurfpea. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Marked with green flag.
Tom Schweich 2477.
25 May 2021.
(
Fragment
)
.
.
 Pediomelum tenuiflorum |
 Pediomelum tenuiflorum |
Thermopsis rhombifolia (Nutt. ex Pursh) Nutt. ex Richardson var. divaricarpa (A. Nelson) Isely. (Syn: Thermopsis divaricarpa A. Nelson ) Spreadfruit Goldenbanner. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Mostly mixed grasses and forbs just below the Cercocarpus montanus belt, with Celtis reticulata, Rhus trilobata, Potentilla fissa, Grindelia squarrosa, and Gutierrezia sarothrae.
Northwestern corner of Golden, south end of Dakota Ridge, a hogback that is structurally a continuation of Dinosaur Ridge, west limb at the south end on a small parcel owned by the City of Golden, 4.32 km. north northwest of the GNIS location of Golden.
Tom Schweich 2475.
25 May 2021.
(
OBI185092‡
)
.
Geraniaceae
Erodium cicutarium (L.) L'Her. ex Aiton. Hemlock-leav'd Crane's-bill. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1716.
6/14/2019.
Grassy southwest facing slope. Also collected here: Alyssum simplex, Euphorbia esula, and Castilleja integra.
Southern end of the hogback in northernmost Golden, 4.15 km. north northwest of the GNIS location of Golden.
Tom Schweich 2264.1
9 May 2020.
(
OBI149327‡
)
.
 Coll. No. 349, Erodium cicutarium |
 Coll. No. 1790, Erodium cicutarium |
 Coll. No. 2063.3, Erodium cicutarium |
 Coll. No. 2063.3, Erodium cicutarium |
 Coll. No. 2063.3, Erodium cicutarium |
Grossulariaceae
Ribes cereum Douglas. Wax Currant. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Most shrubs are Cercocarpus montanus with just a few R, cereum and one Amelanchier alnifolia, plus forbs such as Penstemon virens, Viola nuttallii, and Lappula occidentalis.
Southern end of the hogback in northernmost Golden, 4.17 km. north northwest of the GNIS location of Golden.
Tom Schweich 2270.
9 May 2020.
(
OBI149332‡
REGIS
)
.
 Developing fruit on Ribes cereum. |
 Coll. No. 1091, Rubus deliciosus |
 Coll. No. 1092, Ribes cereum |
Hypericaceae
Hypericum perforatum L. Common St. John's Wort. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
Treated in family Clusiaceae by Ackerman (2015). Hypericaceae retained at rank of Family by APG IV.
- North Hogback Open Space (City of Golden),
4521.
4/11/2026.
Tom Schweich 1741.
6/14/2019.
Foothills shrubland, mostly Cercocarpus montanus; also collected here: Gaillardia aristata; nearby: Campanula rotundifolia, and Muhlenbergia montana.
Hogback at the northern city limits of Golden, nearly to the top of the west slopes. 4.40 km. north northwest of the GNIS location of Golden.
Tom Schweich 2356.1
12 Jun 2020.
(
CS
EIU
)
.
 Coll. No. 1228, Hypericum perforatum |
 Coll. No. 1229, Hypericum perforatum |
Lamiaceae
Marrubium vulgare L. Horehound. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden), Tom Schweich 1725. 6/14/2019. . .
Scutellaria brittonii Porter. Britton's Skullcap. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
4526.
4/11/2026.
Mixed-grass prairie just below foothills mountain mahogany shrubland; collected here: Cerastium arvense, Lomatium orientale, Amelanchier alnifolia, nearby: Cercocarpus montanus.
Southern end of the hogback in northernmost Golden, 4.16 km. north northwest of the GNIS location of Golden.
Tom Schweich 2266.
9 May 2020.
(
CDA0053729‡
EIU
)
.
Linaceae
Linum lewisii Pursh. (Syn: Adenolinum lewisii (Pursh) A. Löve & D. Löve ) Prairie Blue Flax. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1701.
6/14/2019.
Also collected here: Poa pratensis, Secale cereale, Lupinus argenteus, and Lithospermum arvense.
Northwesternmost Golden, between Pine Ridge Road and Dakota Ridge, on the lower part of the west-facing limb of Dakota Ridge, 4.46 km. north northwest of the GNIS location of Golden.
Tom Schweich 2353.
12 Jun 2020.
(
CDA0053751‡
COLO2434132‡
REGIS
)
.
 Coll. No. 3119, Linum perenne. |
 Coll. No. 823, Linum lewisii |
 Coll. No. 1383, Linum perenne |
 Inflorescence of Coll. No. 1951, Linum lewisii |
Onagraceae
Oenothera suffrutescens (Ser.) W. L. Wagner & Hoch. (Syn: Gaura coccinea Pursh , Gaura glabra Lehm. ) Linda Tarde. CalPhotos. Jepson eFlora. SEINet Taxon.
Herbaceous perennial, to 60 cm.; Stipules absent; Leaves alternate, 25 mm. x 5 mm., lanceolate, few toothed; Inflorescence straight, open; Bracts 2-3 mm.; Buds erect; Sepals fused to tip in bud, all coming free, reflexed, 6 mm., not persistent after flowering; Hypanthium 6 mm.; Petals entire; Stamens 8, < stigma; Anthers maturing in unison with stigma; Ovary at flowering > distal internode (ergo infl. "open"); Stigma 4-lobed; Fruit 7 mm., stalk-like base 0, erect, fusiform, gradually wider at middle, puberulent, indehiscent; Seeds few, 2 mm., glabrous, not winged (Decribed from Coll. No. 317, keyed 15 Dec 2012).
- North Hogback Open Space (City of Golden),
Tom Schweich 1723.
6/14/2019.
.
 Coll. No. 317, Oenothera suffrutescens |
 Inflorescence of Coll. No. 1147, Oenothera suffrutescens |
 Overview of Coll. No. 1147, Oenothera suffrutescens |
 Coll. No. 1866, Oenothera suffrutescens |
Orobanchaceae
Orobanche fasciculata Nutt. (Syn: Aphyllon fasciculatum (Nutt.) Torr. & A. Gray ) Clustered Broomrape. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1944.
6/12/2020.
.
Plantaginaceae
Collinsia parviflora Lindl. Maiden Blue-eyed Mary. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Also collected nearby: in the gulch: Veronica biloba; above the gulch: Lupinus argenteus, Euphorbia esula, Lithospermum arvense, Poa pratensis, and Secale cereale.
Northwest corner of Golden, in recently deposited silt in channel of Cressmans Gulch, 60 m. downstream from Pine Ridge Road, 4.51 km. northwest of the GNIS location of Golden.
Tom Schweich 2471.
25 May 2021.
(
Golden
)
.
.
Linaria canadensis (L.) Dum.-Cours. var. texana (Scheele) Pennell. (Syn: Nuttallanthus texanus (Scheele) D. A. Sutton ) Blue Toadflax. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
In sedimentary rocks with Rhus trilobata and Heterotheca villosa.
Name of ridge is taken from Van Horn (1972) Geology of Golden quadrangle, but is otherwise not accepted by the USGS.
Western slope, southernmost end of Dakota Ridge, 4.3 km. north northwest of the GNIS location of Golden
Tom Schweich 2077.
14 Jun 2019.
(
COLO2434660‡
KHD00073441‡
)
.
.
 Coll. No. 2077, Linaria canadensis var. texana |
Linaria dalmatica (L.) Mill. (Syn: Linaria dalmatica (L.) Mill. ssp. dalmatica , Linaria genistifolia (L.) Mill. ssp. dalmatica (L.) Maire & Petitm. ) Dalmatian ToadFlax. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1705.
6/14/2019.
.
.
Penstemon virens Pennell ex Rydb. Front Range Beardtongue. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
In upturned rocks on the spine of the hogback, also seen or collected here: Eriogonum umbellatum, Physaria montana, Ribes cereum, Coryphantha vivipara, and Cercocarpus montanus.
Southern end of the hogback in northernmost Golden, 4.19 km. north northwest of the GNIS location of Golden.
Tom Schweich 2271.
9 May 2020.
(
CDA0053731‡
OBI149333‡
REGIS
)
.
.
Plantago patagonica Jacq. Woolly Plantain. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual, herb, to 10 cm., drying light green; Leaves, basal rosette, 55 mm. × 2.5 mm., narrowly oblanceolate, entire; Peduncle, 55 mm., not grooved, hairs ascending (not spreading), diameter >> than leaf hairs, Inflorescence, scapose, 10-12, in single terminal spikes, axis not visible between flowers; Bract, linear, 1-2 × calyx, exserted; Flower, bisexual, Corolla, lobes 1.8 mm., 1 erect, 3 spreading, tube glabrous (should be hairy); Stamens, 4, inserted; Style 1.2 mm.; Fruit, 2.5 mm Seeds 2, 1.4 mm., inner side deep concave (much easier to dissect fruit and examine seeds when dry, rather than when wetted with Pohl's solution, Described from Coll. No. 281, 24 April 2001).
- North Hogback Open Space (City of Golden),
Tom Schweich 1744.
6/14/2019.
.
.
 Coll. No. 281, Plantago patagonica |
 Coll. No. 1490, Plantago patagonica |
 Coll. No. 1882, Plantago patagonica |
Veronica biloba L. (Syn: Pocilla biloba (L.) W. A. Weber ) Twolobe Speedwell. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Also collected nearby: in the gulch: Collinsia parviflora; above the gulch: Lupinus argenteus, Euphorbia esula, Lithospermum arvense, Poa pratensis, and Secale cereale.
Northwest corner of Golden, in recently deposited silt in channel of Cressmans Gulch, 60 m. downstream from Pine Ridge Road, 4.51 km. northwest of the GNIS location of Golden.
Tom Schweich 2472.
25 May 2021.
(
OBI185090‡
)
.
 Veronica biloba L. |
 Veronica biloba L. |
 Fruit of Coll. No. 2063.1, Veronica biloba |
 Coll. No. 2063.1, Veronica biloba |
Polemoniaceae
Phlox multiflora A. Nelson. Mountain Phlox. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial, tufted, decumbent to ascending, 7-10 cm.; Internodes, 8-9 mm.; Leaves, cauline, opposite, 23 mm. × 2 mm. wide, ±linear, sharp-pointed; Flowers, solitary at ends of stems, pedicels, 12 mm., hairy, calyx, tube 5 mm. + lobes 6 mm., sparsely hairy, hyaline membranes flat; corolla, tube 14 mm + lobes 11 mm. × 7 mm. wide, color (not recorded), fading blue. Described from Coll. No. 1653, 1 Jun 2011.
- North Hogback Open Space (City of Golden),
Determination tentative.
Tom Schweich 2474.
4/26/2022.
Determination tentative.
Tom Schweich 2475.
4/26/2022.
.
 Location of Coll. No. 2487, Phlox multiflora |
 Coll. No. 1814, Phlox, tentatively determined as P. multiflora. |
 Coll. No. 1653, Phlox multiflora |
Polygonaceae
Eriogonum alatum Torrey in L. Sitgreaves, Rep. Exped. Zuni Colorado Rivers. 168, plate 8. 1853. (Syn: Pterogonum alatum (Torr.) Gross ) Winged Buckwheat. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
many little black bugs with red spots
4272.
7/20/2025.
Tom Schweich 1726.
6/14/2019.
Foothills grassland, below any significant concentration of shrubs, also collected here: Rhus trilobata, Tragia ramosa, Grindelia squarrosa, and Gutierrezia sarothrae.
Northwesternmost city limits of Golden, west side of Dakota Ridge (North Hogback), about 1/4 of the way up the west slope from Cressmans Gulch, 2.65 km. north northwest of the GNIS location of Golden.
Tom Schweich 2398.
29 Jul 2020.
(
CS
UC
)
.
.
Eriogonum umbellatum Torr. var. umbellatum. Sulphur-Flower Buckwheat. CalPhotos. Jepson eFlora. SEINet Taxon.
Type collected “near the Rocky Mountains” by Edwin James, 1820. Described by Torrey in 1827.
- North Hogback Open Space (City of Golden),
likely var. umbellatum
Tom Schweich 1742.
6/14/2019.
Open herbaceous vegetation, ponderosa pines and mountan mahogany shrubland nearby. Also collected here: Heterotheca villosa, Hesperostipa comata, and Koeleria macrantha.
Hogback at the northern city limits of Golden, more or less flat area on top of ridge, 4.38 km. north northwest of the GNIS location of Golden.
Tom Schweich 2357.
12 Jun 2020.
(
COLO2434157‡
OBI149316‡
)
.
.
Rumex crispus L. Curley Dock. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
4528.
4/11/2026.
.
.
 Coll. No. 2817, Rumex crispus |
 Coll. No. 818, Rumex crispus |
Rumex venosus Pursh. Veiny Dock. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1694.
6/14/2019.
.
 Rumex venosus by the Middle Loup River. |
Ranunculaceae
Delphinium carolinianum Walter ssp. virescens (Nutt.) R.E. Brooks. (Syn: D. carolinianum Walter ssp. penardii (Huth) L. M. Perry , Delphinium virescens Nutt. ) Plains Larkspur. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Within a band of foothills mountain mahogany shrubland likely aligned with underlying strata; collected nearby: Potentilla recta and Muhlenbergia montana.
Hogback at the northern city limits of Golden, 3/4 of the way up the west-facing slope, 4.37 km. north northwest of the GNIS location of Golden.
Tom Schweich 2359.
12 Jun 2020.
(
UC
)
.
 Coll. No. 2359, Delphinium carolinianum subsp. virescens |
 Coll. No. 1440, Delphinium carolinianum subsp. virescens |
 Coll. No. 1661, Delphinium carolinianum subsp. virescens |
Rosaceae
Amelanchier alnifolia (Nutt.) Nutt. ex M. Roem. Saskatoon Serviceberry. CalPhotos. Jepson eFlora. SEINet Taxon.
Shrub, to 1 m.; Stems, branches unarmed; Leaves, simple, petiole, 8 mm., blade, 22-32 mm. × 19-32 mm. wide, veins, pinnate, surface, sparsely hairy above, sparsely to moderately hairy below, margin, serrate; Flowers, borne singly, pedicels, 10 mm., petals 9 mm. × 4.5 mm. wide, color cream; Ovary, inferior, tip hairy; Styles, #(4)5 (Described from Coll. No. 1800-1801, 7 May 2018)
- North Hogback Open Space (City of Golden),
Above the mixed-grass prairie just into foothills mountain mahogany shrubland; collected here: Ribes cereum, Cercocarpus montanus, and Potentilla recta; nearby: Lomatium orientale, and Scutellaria brittonii.
Southern end of the hogback in northernmost Golden, 4.16 km. north northwest of the GNIS location of Golden.
Tom Schweich 2267.
9 May 2020.
(
CAS
KHD00072472‡
)
.
.
Cercocarpus montanus Raf. Alder-Leaf Mountain Mahogany. CalPhotos. Jepson eFlora. SEINet Taxon.
Described by Rafinesque from a specimen collected by Edwin James of the Long Expedition, 1820, probably in present Jefferson County, Colorado. Rafinesque was somewhat frustrated by Torrey's reluctance publish a new species name in assigning James' collection to C. fothergillides Humb. Bonpl. And Kunth.
- North Hogback Open Space (City of Golden),
Tom Schweich 1731.
6/14/2019.
Foothills shrubland, primarily C. montanus, with Ribes cereum, Rhus trilobata, and Amelanchier alnifolia, and forbs: Physaria montana, Penstemon virens, and Viola nuttallii,
Southern end of the hogback in northernmost Golden, 4.17 km. north northwest of the GNIS location of Golden.
Tom Schweich 2270.1
9 May 2020.
(
OBI149331‡
UCR
)
.
.
Drymocallis fissa (Nutt.) Rydb. (Syn: Potentilla fissa Nutt. ex Torr. & A.Gray ) CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial, herb, caespitose, to 20 cm., terrestrial, not stoloniferous, rhizomatous, glandular-hairy throughout; Stem, erect, green, multicellular viscid hairs; Leaves, basal, 58-125 mm. × 16-26 cm. wide, pinnately compound, leaflets, #11; cauline, #3-4 per stem, alternate, stipules, 5 mm. × 2 mm. wide, lanceolate, entire to once shallowly toothed; petiole, 18 mm., prior years remaining on plant (as sometimes described for P. rupincola), multicellular viscid hairs, leaflets, #7-13, 40-51 mm. × 20-22 mm. wide, petiolulate (not decurrent), 12 mm. × 9 mm. wide, viscid hairy, terminal leaflet (8)10 mm. side, margin, flat, serrate, teeth, 4-6 per side, on distal ¾, tip dark reddish; Inflorescence, congested cyme, with 5-7 flowers; Flowers, limb, 15 mm.; Calyx, lobes, #5, 7-11 mm. × 2.7-4.5 mm. wide, fused ±½, viscid hairy, epicalyx bractlets, 3-5 mm. × 0.8-1.3 mm. wide, ±½ sepals; Receptacle, hairy, <1 mm., Petals, 7-9 mm. × 5-9 mm. wide, obovate, color yellow; Stamens, >25; Anthers, 1.4 mm. × 1 mm. wide; Ovaries, many, superior, glabrous; Styles, widest at middle, or thickest at base, tapered from middle, attached laterally below top of ovary; Stigma, #1; Achenes, glabrous. (Described from Coll. No. 1364, 21 May 2016, and Coll. No. 1911, 31 May 2018).
- North Hogback Open Space (City of Golden),
Mostly mixed grasses and forbs just below the Cercocarpus montanus belt, with Celtis reticulata, Rhus trilobata, Thermopsis rhombifola var. divaricarpa, Grindelia squarrosa, and Gutierrezia sarothrae.
In fractures in rocks of an outcrop identified by a local geologist as Lykins conglomerate.
Northwestern corner of Golden, south end of Dakota Ridge, a hogback that is structurally a continuation of Dinosaur Ridge, west limb at the south end on a small parcel owned by the City of Golden, 4.30 km. north northwest of the GNIS location of Golden.
Tom Schweich 2476.
25 May 2021.
(
Golden
)
.
.
 Coll. No. 1099, Drymocallis fissa |
 Coll. No. 1099, Drymocallis fissa |
 Coll. No. 1911, Drymocallis fissa |
Potentilla recta L. Sulphur Cinquefoil. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 50 cm., hairy throughout, short (0.3 mm.) hairs glandular, long (4 mm.) hairs straight spreading eglandular; Leaves, stem, 7-8 per stem, alternate, stipules, to 20 mm., lobed, petioles, to 80 mm., blade, palmately compound, leaflets, #5, 45 mm. × 14 mm. wide, lobed ½ to mid-rib, progressively reduced above; Calyx, 9 mm. × 9 mm. wide, flattened at base; Petals, 8 mm., yellow; Style, 1.3 mm., tapered throughout, not appearing warty; Achene, 1 mm., attached laterally, reticulate in color, but not texture. Described from Coll. No. 1680, 28 June 2017. “The long, stiff, spreading, tubercle-based hairs on stems and petioles of P. recta, overtopping a layer of short hairs and glands, also serve to distinguish this aggressive species from native P. gracilis at any stage of the life cycle (FNANM).”
- North Hogback Open Space (City of Golden),
One plant with last year's inflorescence; removed.
Tom Schweich 1835.
5/9/2020.
Tom Schweich 1945.
6/12/2020.
.
.
 Coll. No. 1680, Potentilla recta |
Prunus americana Marshall. American Plum. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial woody shrub, spreading, to 2 m., blooming before leafing out; Branches, unarmed, glabrous when young, peeling to brown; Leaves, (immature, at time of flowering), simple, 15-19 mm. × 5.5-8 mm. wide, lanceolate or elliptic-rhomboid, pinnately veined, glabrous, margin toothed, teeth eglandular, base slightly hairy, petiole 3 mm., adaxially hairy; Flowers, in small groups of 2-3; Pedicels, 9-18 mm., glabrous to sparsely hairy; Hypanthium, 2 mm.; Sepals, 2.5-2.8 mm., reflexed, few cobwebby hairs adaxially; Petals, free, white, 5-7 mm. × 2.5-4.5 mm. wide; Stamens, many (30?); Ovary superior; Styles #1, 10 mm.; Fruit unknown (Described from Coll. No. 1093, 30 Apr 2015, and Coll. No. 1819, 16 May 2018).
- North Hogback Open Space (City of Golden),
South end of clay mines, behind the fence, with Pinus ponderosa.
(I reached through the fence to make the collection; did not climb over it.)
South end of hogback in northernmost Golden, 4.0 km. north northwest of the GNIS location of Golden.
Tom Schweich 2760.
26 Apr 2022.
(
UCR
)
.
.
Prunus virginiana L. Chokecherry. CalPhotos. Jepson eFlora. SEINet Taxon.
The most useful distinction is between chokecherries found east of the Rocky Mountains, var. virginiana and those found from the mountains westward, var. demissa. Plants of the High Plains show intergradation between those of the Rockies and those of the East.
- North Hogback Open Space (City of Golden),
Tom Schweich 1737.
6/14/2019.
Tom Schweich 1942.
6/12/2020.
.
.
Rosa arkansana Porter. Prairie Rose. CalPhotos. Jepson eFlora. SEINet Taxon.
Low-growing perennial, to 20 cm.; Stem, straight slender unequal prickles, present on new growth; Leaves, alternate, compound, leaflets (7)9-11, 20 mm. × 9 mm. wide, serrate, teeth dark-tipped, unclear whether there is glandular exudate, sparsely villous on both sides; Flowers, in clusters of 2-5; Sepals, 16 mm. × 3 mm. wide, abaxial, stalked glandular, adaxial, glandular hairy; Petals, 28 mm. × 21 mm. wide, color pink (Described from Coll. No. 1456, 27 June 2016).
- North Hogback Open Space (City of Golden),
4275.
7/20/2025.
.
.
 Coll. No. 3410, Rosa arkansana. |
 Coll. No. 3410, Rosa arkansana. |
 Coll. No. 1456, Rosa arkansana |
 Coll. No. 1670, Rosa arkansana |
 New growth of Coll. No. 1670, Rosa arkansana |
Rubus deliciosus Torr. (Syn: Oreobatus deliciosus Torr.(E. James ex Torr.) Rydb. ) Delicious raspberry. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial shrub, to 1.5 m.; Stem, bark, shreddy; Leaves, simple, 17 mm. × 23 mm. wide, palmate veined, lobed, serrate, few straight hairs, petiole, 11 mm.; Flowers, white, solitary, 17-19 mm.; Fruit, unknown (Described from Coll. No. 1091, 30 Apr 2015).
- North Hogback Open Space (City of Golden),
4274.
7/20/2025.
.
Coll. No. 1091, Rubus deliciosus |
 Coll. No. 1091, Rubus deliciosus |
 Coll. No. 1091, Rubus deliciosus |
Salicaceae
Populus deltoides Marshall ssp. monilifera (Aiton) Eckenw. (Syn: Populus sargentii Dode ) Plains Cottonwood. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1747.
6/14/2019.
Tom Schweich 3551.
11 Apr 2026.
(
Undist.
)
.
.
Salix exigua Nutt. Coyote Willow, Narrow-Leaved Willow. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial erect shrub, to 2 m.; Leaves, alternate, 21 mm. ×. 1.8 mm. wide, 11.7 ×long as wide, abaxial villous, adaxial mostly glabrous, margins entire, slightly revolute; Staminate catkins, 30 mm. × 6 mm. wide; Pistillate catkins, 42 mm. × 4 mm. wide, floral bract, 1.8 mm., capsule, 2.6 mm., glabrous (Described from Coll. No. 1880, 24 May 2018).
- North Hogback Open Space (City of Golden),
4267.
7/20/2025.
.
.
 Pistillate catkin of Coll. No. 1880, Salix exigua |
 Staminate catkin of Coll. No. 1880, Salix exigua |
Salix irrorata Andersson. Dewystem Willow. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Determination tentative, stems not particulatly dewey.
4527.
4/11/2026.
This parcel designated the North Golden Hogback Open Space in July 2025.
On the lowest stream terrace of a dry wash (Cressman Gulch) that runs along the southwest side of the open space, 3.35 km. northwest of the GNIS location of Golden.
Tom Schweich 3456.
20 Jul 2025.
(
CS
KHD
OBI
)
.
 Coll. No. 3549, Salix irrorata. |
 Coll. No. 2490, Salix irrorata. |
 Coll. No. 3456, Salix irrorata. |
 Coll. No. 3550, Salix irrorata |
Santalaceae
Comandra umbellata (L.) Nutt. ssp. pallida (A. DC.) Piehl. (Syn: Comandra umbellata (L.) Nutt. var. pallida (A. DC.) M. E. Jones ) Pale Bastard Toadflax. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1727.
6/14/2019.
.
Scrophulariaceae
Verbascum thapsus L. Common Mullein. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1693.
6/14/2019.
.
 Package of Mullein in the Pharmacy at Fort Hartsuff. |
 Dense colonies of Common Mullein (Verbascum thapsus) in Cottonwood Canyon |
 Collection No. 512, Verbascum thapsus |
Solanaceae
Physalis longifolia Nutt. Longleaf Groundcherry. CalPhotos. Jepson eFlora. SEINet Taxon.
“Most specimens originally identified as P. virginiana actually belong to P. longifolia” (Ackerfield, 2015). “[P. virginiana] has many races that are often treated as varieties or even separate species, including P. longifolia Nuttall” (Weber & Wittmann, 2012).
- North Hogback Open Space (City of Golden),
Top of a waste pile. Also collected here: Chenopodium album and Dipsacus laciniatus.
Northwestern-most Golden, in the pit of a former clay mine, accessed by way of the City of Golden Cressman Gulch Trail and then a social/game trail, 4.28 km. north northeast of the GNIS location of Golden.
Tom Schweich 2396.
29 Jul 2020.
(
KHD00073467‡
OBI149101‡
UCR297628‡
)
.
 Coll. No. 3474, Physalis longifolia. |
Ulmaceae
Ulmus pumila L. Siberian Elm. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1749.
6/14/2019.
.
 Figure 1. Composite photo of Siberian elm (Ulmus pumila L.) |
Undet.
Undetermined . CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Marked with green flag.
Tom Schweich 2477.
25 May 2021.
(
Fragment
)
.
 Accidental Coll. No. 1240.1, Undetermined |
 Coll. No. 1248, Undetermined |
Violaceae
Viola nuttallii Pursh. Nuttall's Violet. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Mixed Foothill Shrubland; also collected here: Ribes cereum, Amelanchier alnifolia, Cercocarpus montanus, Potentilla recta, and Bromus tectorum,
Southern end of the hogback in northernmost Golden, 4.15 km. north northwest of the GNIS location of Golden.
Tom Schweich 2269.
9 May 2020.
(
CAS
CDA0053730‡
COLO2433779‡
)
.
Amaryllidaceae
Allium textile A. Nelson & J.F. Macbr. Textile Onion. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1724.
6/14/2019.
.
 Coll. No. 2302, Allium textile |
 Habitat of Coll. No. 1134, Alliaceae Allium textile |
 Coll. No. 2933, Allium textile |
 Bulb coat of Coll. No. 1134, Allium textile |
 Coll. No. 1134, Allium textile |
Asparagaceae
Leucocrinum montanum Nutt. ex A. Gray. Star Lily. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Southwest facing slope: with Euphorbia esula, Grindelia squarrosa, Taraxacum officinale, Gutierrezia sarothrae, Artemisia ludoviciana, A. frigida, Andropogon gerardi, and Coryphantha vivipara.
Lower slopes of hogback in northernmost Golden, 4.1 km. north northwest of the GNIS location of Golden.
Tom Schweich 2757.
26 Apr 2022.
(
Golden
)
Also here: Linum lewisii, Bromus inermis, Yucca glauca, and Liatris punctata.
Seven plants here; one collected.
Lower western slope of hogback in northernmost Golden, 4.3 km. north northwest of the GNIS location of Golden.
Tom Schweich 2758.
26 Apr 2022.
(
Golden
)
.
.
Yucca glauca Nutt. Soapweed Yucca. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1709.
6/14/2019.
.
 Yucca glauca “Soapweed Yucca” on Dakota Ridge. |
Commelinaceae
Tradescantia occidentalis (Britton) Smyth. Prairie Spiderwort. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
Tom Schweich 1733.
6/14/2019.
.
 A Tradescantia occidentalis “Prairie Spiderwort” with intense color. |
 Habitat of Coll. No. 1142, Tradescantia occidentalis |
 Color variation in Tradescantia occidentalis. |
Cyperaceae
Carex inops L. H. Bailey ssp. heliophila (Mack.) Crins. (Syn: C. pensylvanica Lam. ssp. heliophila (Mack.) W. A. Weber ) Sun Sedge. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 16 cm., prior year leaves to 23 cm.; Rhizome, 5-10(12) cm.; Culm, 11.5 cm. × 0.6 mm., ±triangular, but obscured by white striations at least when dry; Leaves, 12 cm. × 1.5 mm., ±flat, some folded ≤30°.; Inflorescence, multiple spikes, all approximate, 1-2 pistillate spike(s) below, 1 staminate spike above; Bracts, lowest, blade 8 mm., sheath 4.5 mm., papery; Pistillate spike, peduncled 1.0-1.3 mm., 9 mm., brown (not black); Staminate spike, terminal, 12-16 mm., ovoid (not cylindric), brown (not black); Scales, >perigynum body; Perigynum, pubescent on faces, margin ciliate; Achenes, unknown. Described from Coll. No. 1079, 23 April 2015, and Coll. No. 1568, 3 Apr 2017.
- North Hogback Open Space (City of Golden),
4519.
4/11/2026.
.
Poaceae
Andropogon gerardii Vitman. Big Bluestem. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial, to 85 cm., clumped, rhizomes unknown; Leaves, blade and sheath differentiated; Sheath, 11 cm., open; Ligule, membraneous (though surrounded by hairs), 3 mm., auricles 0; Blade, soft, flat, 27 cm., hairy near ligule; Inflorescence, 80 mm., > leaves, 1-2 per stem, in 5-6 digitate branches, spikelets many; Rachis, soft bristles on margins and at nodes; Disarticulation at nodes of rachis; Spikelets in pairs, Sterile spikelet, 7 mm., pedicel 4.5 mm.; Fertile spikelet, Florets #1, Glumes, awns 0, ±equal, lower keeled, upper flattened and grooved; Lemma, 6 mm., membraneous, rolled, glabrous, tip 2-forked, awn, #1, 13 mm., bent, twisted, attached on back; Stamens, 3; Anthers, yellow; Ovary, glabrous; Stigma, feathery. (Described from Coll. No. 1060, 28 Aug 2014).
- North Hogback Open Space (City of Golden),
4273.
7/20/2025.
in rock outcrops along top of ridge
Tom Schweich 1984.
7/29/2020.
.
.
 Dissected spikelet pair of Coll. No. 1060, Andropogon gerardii |
 Inflorescence of Coll. No. 1265, Andropogon gerardii |
 Spikelets of Coll. No. 1265, Andropogon gerardii |
Bromus japonicus Thunb. Japanese Cheat Grass. CalPhotos. Jepson eFlora. SEINet Taxon.
Coll. No. 1207, 13 Jul 2015, characters observed: Annual grass, to 40 cm.; Leaves, sheath, 60 mm. closed + 12 mm. open, pilose (but not densely so), ligule, membraneous, + some hairs, blade, hairy; Inflorescence, panicle, >leaves; Pedicel, 20 mm.; Spikelets, 1-3 per panicle branch, 22 mm. × 6 mm. wide, elliptical, drooping; Glumes, #2, <lowest floret, lower, 4.5 mm., veins 3, upper, 5.5 mm., veins 5; Rachilla, short hairy; Callus, glabrous; Florets, #12, 2-ranked, closely held hiding rachilla; Disarticulation between florets; Lemma, 8 mm. × 4 mm. wide, margin, hyaline, 0.5 mm., tip bifid, awn, #1, 5-12 mm. long, mid-spikelet awns longest, flattened at base, not twisted, attached near bifid tip. Described from Coll. No. 1207, 13 Jul 2015.
- North Hogback Open Space (City of Golden),
Tom Schweich 1698.
6/14/2019.
Also collected here: Helianthus pumilis, and Nassella viridula, and nearby: Hypericum perforatum, Potentilla recta, and Muhlenbergia montana.
Hogback at the northern city limits of Golden, 3/4 of the way up the west-facing slope, at the lower edge of Cercocarpus montanus, 4.41 km. north northwest of the GNIS location of Golden.
Tom Schweich 2355.
12 Jun 2020.
(
EIU
OBI149322‡
UCR297598‡
)
.
.
 Coll. No. 1207, Bromus japonicus |
 Coll. No. 1461, Bromus japonicus |
 Coll. No. 1207, Bromus japonicus |
 Coll. No. 1207, Bromus japonicus |
Bromus tectorum L. (Syn: B. tectorum L. var. glabratus Spenn. ) Cheat Grass. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual grass, to 30 cm.; Leaves, Sheath, 50 mm., closed proximal ⅔, open distally, Ligule, membraneous, 1 mm.; Blade, 60 mm.; Inflorescence, open panicle, rachis and pedicels short hairy, Spikelets, 1 per node, 15 mm., laterally compressed; Glumes, 2, sparsely hairy, margins scarious, lower, 2.3 mm., veins indistinct, upper, 4.5 mm. Callus, glabrous, very short, Florets, ±6, Lemma, 6.5 mm., 0.7 from mid-vein to margin, back rounded, sparsely hairy, tip, forked, teeth 1 mm., awned from near tip, awn, 5-7 mm.; Anthers, 3, 0.4 mm. Described from Coll. No. 1112, 26 May 2015. Dimensions are small for B. tectorum, perhaps because of the early date of collection.
- North Hogback Open Space (City of Golden),
Tom Schweich 1699.
6/14/2019.
Southwest slope, near top of hogback; foothills mountain mahogany shrubland; also collected here: Ribes cereum, Amelanchier alnifolia, Cercocarpus montanus, Potentilla recta, and Viola nuttallii.
Southern end of the hogback in northernmost Golden, 4.16 km. north northwest of the GNIS location of Golden.
Tom Schweich 2268.
9 May 2020.
(
COLO2433761‡
EIU
OBI149325‡
REGIS
)
.
.
 Coll. No. 1112, Bromus tectorum |
Calamovilfa longifolia (Hook.) Scribn. in Hackel. Prairie Sandreed. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial grass, 1 m., thick scaly rhizomes; Nodes, hidden by sheath; Leaves, blade and sheath differentiated; Sheath, >75 mm., open, glabrous to long straight hairs distally; Ligule, hairs, 1.5 mm.; Auricles, absent; Blade, 350 mm. × 7 mm. wide, flat; Inflorescence, 1 per culm, panicle, 180 mm. × 15 mm. wide, 3-4 branches; Rachis, glabrous, not extended; Spikelets, many, 5.5 mm. × 2.5 mm. wide, borne singly, subtended by few long silky hairs; Compression, lateral. Disarticulation, above the glumes; Glumes, lower, 3.5 mm., keeled, veins, #1, upper, 5 mm., < lowest floret, veins, #1, keeled, awns, absent; Callus, straight silky hairs, 3 mm.; Lemma, 5 mm., >glumes, lanceolate, keeled, glabrous, scarious, veins, #1, forming a tiny awn tip, awns, absent; Palea, 4.8 mm., <lemma, colorless, glabrous; Stamens, #2; Anthers, 3.8 mm. (Described from Coll. No. 2397, 29 Jul 2020.)
- North Hogback Open Space (City of Golden),
Partially in the shade of some cottonwood trees, otherwise foothills grassland, also collected nearby: Alyssum simplex, Erodium cicutarium, Euphorbia esula, and Castilleja integra.
Northwesternmost Golden, at the south end of the North Hogback, on a small spoils pile of some sort, 4.07 km. north northwest of the GNIS location of Golden.
Tom Schweich 2397.
29 Jul 2020.
(
COLO2433878‡
KHD00074292‡
)
.
.
 Coll. No. 2397, Calamovilfa longifolia |
 Florets of Coll. No. 2397, Calamovilfa longifolia |
 Spikelets of Coll. No. 2397, Calamovilfa longifolia |
 Spikelets of Coll. No. 2397, Calamovilfa longifolia |
Dactylis glomerata L. Orchard Grass. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial grass, to 1.0-1.2 m.,
not rhizomatous,
basal or subterranean internodes not swollen;
Stem herbaceous;
Leaf,
Sheath open and closed observed, published descriptions are roughly equally divided as to whether the sheath is open or closed,
Ligule membraneous, 5 mm.;
Blade, differentiated from sheath, base not constricted, soft,
25 cm. × 0.7 cm. wide, not sharp-pointed;
Auricle, rounded, <1 mm., generally described as 0;
Infloresence exceeding leaves, 13 cm., panicle, well developed, erect, 1° branches open, branching 4° or 5°;
Spikelets not enclosed in a bur-like involucre,
not subtended by bristles or long silky hairs,
similar throughout plant,
all on one side of rachis,
crowded in dense clusters,
on 2°-4° panicle branches
1 per node,
axis few hairy,
some spikelets appear to be infertile;
Glumes, 2
< lowest floret,
lower, 3.5 mm, smaller and thinner than
upper, 6 mm.,
keeled,
glabrous to ciliate on keel, else sparsely hairy;
Florets
not modified into bulblets
4+ per spikelet ,
have feathery stigma-like material but no ovary (immature?),
uppermost vestigal floret not club-shaped rudiment (as seen in Melica);
Lemma
lowest largest, 5 mm., reduced above,
keeled, line of hairs on keel,
5 veins,
tip forked,
awn 1.0-1.5 mm.;
Palea
light green
with 2 veins
forked at tip.
Described from Collection No. 815, 9 May 2012, Alameda County, CA and
Coll. No. 1111, 26 May 2015, Jefferson County, CO.
- North Hogback Open Space (City of Golden),
Tom Schweich 1750.
6/14/2019.
.
.
Elymus canadensis L. Canadian Wildrye. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial grass, to 0.7-1.2 m., non-rhizomatous; Culm, cauline nodes hidden by sheath; Inflorescence, terminal spike, 20 cm. × 1.5 cm. wide, ±erect to curving to drooping; Rachis, mostly glabrous, internodes, 5 mm.; Spikelets, sessile, 2 per node, 15 mm. × 5 mm. wide (excluding awns), ascending; Glumes, #2, 21-25 mm., nearly subulate, flattened and slightly broadened above base, indistinct body 8-10 mm. × 1 mm. wide + awn 14-15 mm., veins 5?, entire, scabrous; Florets, #5, bisexual; Rachilla, short hairy; Callus, glabrous; Lemma, 10-13 mm., veins 5, rounded, hairy, awns, #1, 22-35 mm., curving when dry; Palea, 9.5 mm.; Stamens, #3, 4 mm. Described from Coll. Nos. 1237 and 1699.
- North Hogback Open Space (City of Golden),
Tom Schweich 1751.
6/14/2019.
.
.
 Coll. No. 1699, Elymus canadensis |
 Coll. No. 1237, Elymus canadensis |
 Coll. No. 1237, Elymus canadensis |
Hesperostipa comata (Trin. & Rupr.) Barkworth. (Syn: Stipa comata Trin. & Rupr. ) Needle and Thread. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial, 50 cm., clumped, nonrhizomatous; Roots, fibrous; Stem, herbaceous; Leaves, blade and sheath differentiated; Sheath, 100-120 mm., open ≥½, glabrous; Ligule, membranous, length 3.7 mm., lacerate into 2 equal parts, auricles 0; Blade, 60 mm., involute, glabrous; Inflorescence, 1 per culm, >leaves, panicle, 200 mm. × 30 mm. wide; Rachis, not extended, somewhat scabrous throughout; Spikelets, many, similar, borne singly; Compression, unremarkable; Disarticulation, above the glumes; Glumes, lower, 23-34 mm., veins #3, upper, 23-29 mm., veins #5, awl-shaped, rounded, membranous, ±equal, tip, very narrow, not awned; Florets, 1 per spikelet; Callus, 4.5-50 mm., sharp, straight hairs 1.0-1.5 mm., color tan; Lemma, 9.5-10.0 mm., rolled, indurate, straight hairy 0.5 mm., color white-tan, veins #3(?), awns, #1, 125-160 mm., twisted and short straight hairy proximal 45 mm., bent, scabrous distally; Palea, 9 mm., ±lemma, few white hairs on mid-vein; Stamens, #3; Anthers, 6.5 mm. (Described from Coll. No. 1890, 28 May 2018).
- North Hogback Open Space (City of Golden),
Tom Schweich 1710.
6/14/2019.
Tom Schweich 1943.
6/12/2020.
.
.
 Coll. No. 992, Stipa comata var. comata |
 Coll. No. 1929, Hesperostipa comata |
 Florets of Coll. No. 1890, Hesperostipa comata |
Koeleria macrantha (Ledeb.) Schult. Prairie Junegrass. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial bunch grass, to 45-55 cm., non-rhizomatous; Leaves, mostly basal or lowest cauline, cauline, sheath, 90 mm., open, ligule, <1-1.5 mm., membraneous, auricles, 0, blade, 40 mm., tip prow-shaped or merely constricted; Inflorescence, panicle, 60 mm. × 9 mm., shiny in anthesis due to exposure of translucent palae, short branches, branches short soft hairy; Spikelets, 5 mm., 1 per node on 1°-3° or indistinct panicle branches; Glumes, lower, 3 mm., veins 1, upper, 4 mm., veins 3; Florets, 3, #1 and #2 pistillate, #3 staminate, or variously mixed bisexual and pistillate, open, i.e., palea separated from lemma; Disarticulation, between florets; Rachilla hairy, extends nearly 1 mm. above upper floret (or not); extension undecorated; Lemma, 4.5 mm., veins 5, short hairy throughout, awn, 0-0.5 mm., short, soft; Palea, =lemma, translucent or colorless, exposed, i.e., outside lemma.; Stamens, 3, 1.8 mm. Described from Coll. No. 1131, 9 June 2015, and Coll. No. 1144, 15 Jun 2015.
- North Hogback Open Space (City of Golden),
Tom Schweich 1736.
6/14/2019.
Open herbaceous vegetation, ponderosa pines and mountain mahogany shrubland nearby. Also collected here: Heterotheca villosa, Hesperostipa comata, and Eriogonum umbellatum var. umbellatum.
Hogback at the northern city limits of Golden, dry and more or less flat area on top of ridge, 4.38 km. north northwest of the GNIS location of Golden.
Tom Schweich 2357.1
12 Jun 2020.
(
CS198713‡
EIU
)
.
.
 Coll. No. 1131, Koeleria macrantha |
 Coll. No. 1117, Koeleria macrantha |
 Coll. No. 1131, Koeleria macrantha |
 Inflorescence of Coll. No. 1419, Koeleria macrantha |
Muhlenbergia montana (Nutt.) Hitchc. Mountain Muhly. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial grass, to 50 cm., caespitose; Leaves, sheath, open, ligule, membraneous, 4.5 mm., auricles, 0, blade, 110 mm. × 1 mm. wide; Inflorescence, rather sparse contracted panicle, 120 mm.; Florets per spikelet, #1; Glumes, #2, papery, toothed, lower, 1.5 mm., upper, 2 mm., teeth 3; Lemma, 3 mm. + awn 13 mm., flexuous, tuft of hairs at base; Palea, 2.8 mm. Described from Coll. No. 1282, 28 Aug 2015.
- North Hogback Open Space (City of Golden),
Mixed foothill shrubland, also collected nearby: Delphinium carolinianum var. virescens, Andropogon gerardii, and Schizachyrium scoparium.
Northwesternmost city limits of Golden, west side of Dakota Ridge (North Hogback), near the top of ridge, 2.67 km. north northwest of the GNIS location of Golden.
Tom Schweich 2404.
29 Jul 2020.
(
CAS
CDA0053769‡
COLO2433969‡
)
.
.
 Coll. No. 1282, Muhlenbergia montana |
 Inflorescence of Coll. No. 1282, Muhlenbergia montana |
Nassella viridula (Trin.) Barkworth. (Syn: Stipa viridula Trin. ) Green Needlegrass. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial grass, 70-100 cm., clumped, non-rhizomatous; Stem, herbaceous; Leaves, cauline, sheath, 17 mm., ligule, 3 mm., membraneous, collar with few hairs at sides, blade, to 30 cm., convolute; Inflorescence, 1 per culm, panicle, 20-25 cm.; Rachis, lightly scabrous, not extended beyond upper spikelet; Compression, unremarkable; Spikelets, 1 per node; Florets, 1 per spikelet, bisexual; Glumes, 2, 8-9 mm., ±equal, rounded, membraneous, colorless, exc. 3 green veins, tip, short (2 mm.) hair-like awn; Disarticulation, above the glumes, Florets, 1 per spikelet; Callus, short; Lemma, 5-6 mm. × 1.2 mm. wide, <glumes, green, hairy, <1 mm., indurate, enclosing grain, awns, #1, 20-25 mm., twisted, bent, short hairy (±0.2 mm.); Palea, 1.5-2.0 mm., <lemma, membraneous, glabrous; Stamens, #3. Described from Colls. No. 1146, 1652, and 1698.
- North Hogback Open Space (City of Golden),
Tom Schweich 1711.
6/14/2019.
Tom Schweich 1940.
6/12/2020.
.
.
 Inflorescence of Coll. No. 1146, Nassella viridula |
 Inflorescence of Coll. No. 1146, Nassella viridula |
 Inflorescence of Coll. No. 1652, Nassella viridula |
Poa compressa L. Canada Bluegrass. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial, 35-80 cm.; Root fibrous; Rhizomes not seen to numerous; Culms, compressed; Nodes, compressed; Leaf blade and sheath differentiated, soft; Sheath 40-55 mm., open top ¾ to full length; Blade, 40-55 mm., folded; Ligule membraneous, 1-4 mm.; Inflorescence 1 per culm, panicle, contracted, > leaves, 45 mm. × 12 mm. wide, spikelets many; Compression, lateral; Disarticulation, above the glumes, between the florets; Spikelets, similar, 1 per node, 1°-3° branches, 4 mm. × 1.5 mm. wide, bisexual; Florets per spikelet 3-5; Glumes #2, lower, 2(3) mm., veins #3, upper, 2.2(3) mm., < lowest floret; Callous glabrous; Lemma, 2 mm., keeled, few hairs near base, veins, 5 neither equally spaced nor prominent (much easier to see if you soften the lemmas with Pohl's solution!), tip, obtuse, awns 0; Palea, 2 mm., veins, green, sparsely scabrous; Anthers, #3, 1.6 mm.; Ovary glabrous. Described from Coll. No 861, 1231, and 1677.
- North Hogback Open Space (City of Golden),
Damp soil, just below storm drain outfall, with Bouteloua gracilis and Bromus japonicus.
This parcel designated the North Golden Hogback Open Space in July 2025.
In the bottom of the dry wash (Cressman Gulch) that runs along the southwest side of the open space, 3.27 km. northwest of the GNIS location of Golden.
Tom Schweich 3454.
20 Jul 2025.
(
FLD
OBI
UCR
)
.
.
 Habitat of Coll. No. 1231, Poa compressa |
 Coll. No. 1677, Poa compressa |
 Coll. No. 3454, Poa compressa. |
 Coll. No. 861, Poa compressa |
Poa pratensis L. (Syn: P. agassizensis B. Boivin & D. Löve ) Kentucky Bluegrass. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial grass, to 40-75 cm.; Roots fibrous; Rhizomes slender, light-colored, 0.8-1.0 mm. dia., to 12 cm.; Culm, not bulbous at base, not strongly flattened; Nodes; Leaf blades and sheath differentiated, soft, Sheath, 85-130 mm., open at least ½; Auricles 0; Ligules membraneous, ≤1 to 1.8 mm.; Blade, lower involute or folded, upper flat, 25-75 mm. × 3 mm. wide, margin, scabrous, tip ±prow-shaped (or not); Inflorescence 1 per culm, terminal, panicle, 70-130 mm. × 33-65 mm. wide, pyramidal, branches scabrous; Rachis, not extended, glabrous; Spikelets, 4-5 mm. × 2.5 mm. wide, similar throughout plant, singly pedicelled on 2°-5° branches, pedicels 0.5-2.0 mm., with both pistillate and staminate florets; Compression lateral; Disarticulation above the glumes; Glumes, keeled, keels, glabrous, scabrous, or with small line of stiff hairs distally, lower, 2.0-2.8 mm., <lowest lemma, veins 1 or 3, upper, 2.5-3.0 mm., veins 3; Florets, #(2)3-4 per spikelet (eliminates Agrostis), mostly bisexual; Rachilla, extends 1 mm. above upper floret, not hairy; Callus long cobwebby hairs (distinctive!), or with some cobwebby hairs, but cobwebby hairs also elsewhere; Lemma 2.7-3.0 mm., >glumes, glabrous, veins 3-5, likely 5 as the 2 outer veins that are visible are quite near margins, short hairy on keel and margins cobwebby proximally, margins scarious, tip broadly acute, Awns 0; Palea 2.3-3 mm., ≤lemma, membraneous, green, esp. on veins, keel scabrous, intercostal regions narrow and glabrous; Anthers #3, 1-1.6 mm., purple (streaked); Stigma feathery, white. Described from Coll. Nos. 470 & 860, Mono County, CA, and Coll. Nos. 1118, 1420 & 1889, 2057, Jefferson County, CO. Subspecies of P. pratensis are not recognized in Colorado (Weber&Wittmann 2012, Ackerman 2015).
- North Hogback Open Space (City of Golden),
Also collected here: Secale cereale, Linum lewisii, and Lupinus argenteus.
Northwesternmost Golden, between Pine Ridge Road and Dakota Ridge, on a terrace above Cressmans Gulch, 4.50 km. north northwest of the GNIS location of Golden.
Tom Schweich 2351.
12 Jun 2020.
(
CAS
COLO2433621‡
UC
)
.
.
 Coll. No. 2057, Poa pratensis |
 Coll. No. 3019, Poa pratensis. |
 Inflorescence of Coll. No. 1420, Poa pratensis |
 Roots of Coll. No. 1420, Poa pratensis |
Schizachyrium scoparium (Michx.) Nash. Little Bluestem. CalPhotos. Jepson eFlora. SEINet Taxon.
- North Hogback Open Space (City of Golden),
in rock outcrops along top of ridge
Tom Schweich 1983.
7/29/2020.
.
.
 Schizachyrium scoparium (Little Blue Stem) in the Mines Survey Field. |
 Coll. No. 1735, Schizachyrium scoparium |
 Coll. No. 1262, Schizachyrium scoparium |
 Coll. No. 1262, Schizachyrium scoparium |
Secale cereale L. Cereal Rye. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual, erect, 75-100 cm., not rhizomatous; Roots, fibrous; Stem, herbaceous; Nodes, constricted, purple; Leaf, sheath, 115 mm., open, ligule, minimal, membraneous, auricle, 0.6-1.0 mm., blade, 170 mm. × 5 mm. wide, flat, minutely scabrous; Inflorescence, 1 per culm, terminal 2-sided spike, 100-110 mm. × 9 mm. wide; Rachis, nodes 2.0-3.5 mm., bilateral tufts of straight hairs; Spikelets, many, 1 per node, sessile, bases not embedded in rachis; Disarticulation, below the glumes; Glumes, 2, awl-like, 8-9 mm., ±equal, <lowest floret, keeled, purplish distally, appearing to hide the rachis but not the lemmas; Florets 2, appear side-to-side, fertile; Lemma, 12-13 mm., asymmetric in x-section, veins, 5, keeled, keel ciliate, margins, one ciliate, the other less so, awned; Awns, attached end, 11-16 mm., short proximally in the inflorescence, lengthening distally, straight to wavy, some slightly twisted; Palea, 11-12 mm, membraneous (Described from Coll. No. 1110 and 2350).
- North Hogback Open Space (City of Golden), Also collected here: Poa pratensis, Linum lewisii, and Lupinus argenteus. Northwesternmost Golden, between Pine Ridge Road and Dakota Ridge, on a terrace above Cressmans Gulch, 4.50 km. north northwest of the GNIS location of Golden. Tom Schweich 2350. 12 Jun 2020. ( CDA0053750‡ COLO2434397‡ OBI149320‡ ) .
| Total number of taxa: | 114 |
| Native Taxa: (serif, italic, bold) | 82 |
| Non-native Taxa: (sans-serif, italic) | 30 |
| Nativity Undetermined: (default font, italic) | 2 |
| Listed Weeds: Identified as Weed | 15 |
Notes:
† -- Data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/consortium/).
‡ -- Southwest Environmental Information Network, SEINet. 2009-2014. http//:swbiodiversity.org/seinet/index.php. Accessed from July 2009 to September 2014.
Locations Included in This Area
If you have a question or a comment you may write to me at: . I sometimes post interesting questions in my FAQ, but I never disclose your full name or address.
[Home Page] [Site Map]
Date and time this article was prepared: 11/3/2026 12:19:26 PM.
