2020

Holosteum umbellatum L.  Jagged Chickweed.

Apex Park - Northern Parcel, Jefferson County, Colorado. Approximate center of area, mid slope, northeast-facing nose of ridge, 4.7 km. south of the GNIS location of Golden. 39.7233°N, 105.2233°W. WGS 1984 Tiny annual, white petals with jagged ends. Also here: Collinsia parviflora.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Micranthes rhomboidea (Greene) Small.  Diamondleaf Saxifrage.

Apex Park - Northern Parcel, Jefferson County, Colorado. Approximate mid-slope, second gulch north of area boundary, northeast-facing slope near ephemeral stream, 4.9 km. south of the GNIS location of Golden. 39.722°N, 105.2216°W. WGS 1984 Elev. 1984 m. Wet, springy area, no running water.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Ranunculus glaberrimus Hook. var. ellipticus (Greene) Greene.  Sagebrush Buttercup.

Apex Park - Northern Parcel, Jefferson County, Colorado. Rocky Mountain Front Range, approximate mid-slope, very close to the southern boundary of the north parcel, 5.0 km. south of the GNIS location of Golden 39.721°N, 105.2211°W. WGS 1984 Elev. 2080 m. Northeast-facing rocky slope, but the plants are growing in deep humus between the rocks.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Claytonia rosea Rydb.  Rocky Mountain Springbeauty.

Apex Park - Northern Parcel, Jefferson County, Colorado. On an old trail, north of and below the Grubstake Trail, 4.85 km. south of the GNIS location of Golden. 39.7223°N, 105.226°W. WGS 1984 Elev. 2075 m. In deep forest duff, mixed douglas fir and ponderosa pine forest, and shrubs.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Collinsia parviflora Lindl.  Maiden Blue-eyed Mary.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northern part of Apex Open Space Park, about mid-slope, along an old road or trail, 4.93 km south of the GNIS location of Golden. 39.7215°N, 105.223°W. WGS 1984 Elev. 2039 m. Gravelly swale, wet but no runnng water, with small shrubs, grasses, etc.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Townsendia hookeri Beaman.  Hooker's Townsend Daisy.

Deadman Gulch, Jefferson County, Colorado. High plains at the base of the Rocky Mountain Front Range, linear northwest trending dry gravelly area, either in a trace of the Golden Fault or adjacent to it, 3.15 km. south of the GNIS location of Golden. 39.734°N, 105.217°W. WGS 1984 Elev. 1818 m. The type locality of T. hookeri is Mount Vernon Canyon, about 5 km. south. Also collected here: Packera plattensis, Euphorbia brachycera, and Ipomopsis spicata.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Balsamorhiza sagittata (Pursh) Nutt.  Arrow-Leaf Balsamroot.

Tin Cup Ridge, Jefferson County, Colorado. Lower slopes of Tin Cup Ridge, the northward extension of Dinosaur Ridge into Golden, a hogback at the base of the Rocky Mountain Front Range, 6.63 km. south of the GNIS location of Golden. 39.7134°N, 105.2044°W. WGS 1984 Elev. 1898 m. About 24 plants here, about half of which are in bloom. Another colony of 60-100 plants a little higher on the hogback. Usually described as a western slope plant. Perhaps planted here. Regardless, it is naturalized and spreading, if not native.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Amelanchier alnifolia (Nutt.) Nutt. ex M. Roem.  Saskatoon Serviceberry.

Tin Cup Ridge, Jefferson County, Colorado. Along the top of “Tin Cup Ridge,” the northward extension of Dinosaur Ridge into Golden, a hogback at the base of the Rocky Mountain Front Range, 6.63 km. south of the GNIS location of Golden. 39.7116°N, 105.2041°W. WGS 1984 Elev. 1930 m. Small plant, less than 1 meter in diameter. Also at this location: Physaria montana.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Leucocrinum montanum Nutt. ex A. Gray.  Star Lily.

Colorado School of Mines Survey Field, Jefferson County, Colorado. Northernmost Survey Field, highest plains at the base of Lookout Mountain and Rocky Mountain Front Range, exposed east-facing alluvial slope, many plants in bloom. 39.739°N, 105.2305°W. WGS 1984 Elev. 1870 m. Also collected nearby: Prunus virginia, Lepidium campestre, Mertensia lanceolata, Ribes cereum, and Lithospermum incisum.

Collected by permit: Colorado School of Mines, 2020, issued: Apr 1, 2020, to: Tom Schweich.

Leucocrinum montanum Nutt. ex A. Gray.  Star Lily.

Apex Park - Northern Parcel, Jefferson County, Colorado. North Parcel, western edge, Rocky Mountain Front Range, top of the initial slope, small ravine, 4.8 km south-southwest of the GNIS location of Golden. 39.7229°N, 105.2289°W. WGS 1984 Elev. 2044 m. Southeast facing slope, open grassland at edge of ponderosa pine woodland, many leaves have been eaten. Also collected here: Viola nuttallii, and Cerastium arvense.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Viola nuttallii Pursh.  Nuttall's Violet.

Apex Park - Northern Parcel, Jefferson County, Colorado. North Parcel, western edge, Rocky Mountain Front Range, top of the initial slope, small ravine, 4.8 km south-southwest of the GNIS location of Golden. 39.7229°N, 105.2289°W. WGS 1984 Elev. 2101 m. Few plants, southeast facing slope of ravine, open grassland at edge of ponderosa pine woodland. Also collected here: Leucocrinum montanum, and Cerastium arvense.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Cerastium arvense L. ssp. strictum Gaudin.  Field Chickweed.

Apex Park - Northern Parcel, Jefferson County, Colorado. North Parcel, western edge, Rocky Mountain Front Range, top of the initial slope, small ravine, 4.7 km south-southwest of the GNIS location of Golden. 39.7235°N, 105.2289°W. WGS 1984 Elev. 2094 m. Drier divide between two swales, open grassland at edge of ponderosa pine woodland, one Delphinium nuttallii here. Also collected here: Leucocrinum montanum, and Viola nuttallii.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Viola canadensis L.  Canadian White Violet.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northwest corner of Apex Park, wooded south side of Deadman Gulch, 4.65 km south southeast of the GNIS location of Golden. 39.7241°N, 105.2296°W. WGS 1984 Elev. 2104 m. Early spring blooming, deep shade, elk bedding area. Also collected here Mertensia lanceolata, a Prunus, possibly a domestic sp., and Euphorbia myrsinites.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Mertensia lanceolata (Pursh) DC.  Prairie Bluebells.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northwest corner of Apex Park, east-facing slope north of Deadman Gulch, 4.60 km south southeast of the GNIS location of Golden. 39.7244°N, 105.2295°W. WGS 1984 Elev. 2095 m. Openings in ponderosa pine woodland, also seen here; Mondarda fistulosa, Berberis reptans, and Delphinium nuttallii.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Prunus americana Marshall.  American Plum.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northwest corner of Apex Park, east-facing slope north of Deadman Gulch, 4.59 km south southwest of the GNIS location of Golden. 39.7245°N, 105.2294°W. WGS 1984 Elev. 2094 m. Also collected nearby, Viola canadensis in Ponderosa pine woodland, Mertensia lanceolata, and Euphorbia myrsinites.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Micranthes rhomboidea (Greene) Small.  Diamondleaf Saxifrage.

Apex Park - Northern Parcel, Jefferson County, Colorado. South side of Deadman Gulch, near the top of the initial Front Range scarp, 4.38 km. south southeast of the GNIS location of Golden. 39.7255°N, 105.2255°W. WGS 1984 Elev. 2041 m. Flower. Openings in Ponderosa Pine Woodland. Also collected here: Collinsia parviflora.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Euphorbia esula L.  Leafy Spurge.

Dakota Ridge, Jefferson County, Colorado. Southern end of the hogback in northernmost Golden, 4.15 km. north northwest of the GNIS location of Golden. 39.7811°N, 105.238°W. WGS 1984 Elev. 1850 m. Grassy southwest facing slope. Many plants here. Colorado Noxious Weed List B.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Alyssum simplex Rudolphi.  European Madwort.

Dakota Ridge, Jefferson County, Colorado. Southern end of the hogback in northernmost Golden, 4.15 km. north northwest of the GNIS location of Golden. 39.7811°N, 105.2378°W. WGS 1984 Elev. 1869 m. Grassy southwest facing slope. Also collected here: Erodium cicutarium, Euphorbia esula, and Castilleja integra.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Erodium cicutarium (L.) L'Her. ex Aiton.  Redstem Stork's Bill.

Dakota Ridge, Jefferson County, Colorado. Southern end of the hogback in northernmost Golden, 4.15 km. north northwest of the GNIS location of Golden. 39.7811°N, 105.2379°W. WGS 1984 Elev. 1869 m. Small plants. Flower and fruit. Grassy southwest facing slope. Also collected here: Alyssum simplex, Euphorbia esula, and Castilleja integra.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Cerastium arvense L. ssp. strictum Gaudin.  Field Chickweed.

Dakota Ridge, Jefferson County, Colorado. Southern end of the hogback in northernmost Golden, 4.16 km. north northwest of the GNIS location of Golden. 39.7813°N, 105.2377°W. WGS 1984 Elev. 1873 m. Southwest-facing slope, with Artemisia ludoviciana, Linum lewisii, and Grindelia squarrosa.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Lomatium orientale J.M. Coult. & Rose.  Northern Idaho Biscuitroot.

Dakota Ridge, Jefferson County, Colorado. Southern end of the hogback in northernmost Golden, 4.16 km. north northwest of the GNIS location of Golden. 39.7813°N, 105.2377°W. WGS 1984 Elev. 1873 m. Fruit. Mixed-grass prairie just below foothills mountain mahogany shrubland; collected here: Cerastium arvense, Scutellaria brittonii, Amelanchier alnifolia, nearby: Cercocarpus montanus.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Scutellaria brittonii Porter.  Britton's Skullcap.

Dakota Ridge, Jefferson County, Colorado. Southern end of the hogback in northernmost Golden, 4.16 km. north northwest of the GNIS location of Golden. 39.7813°N, 105.2376°W. WGS 1984 Elev. 1874 m. Mixed-grass prairie just below foothills mountain mahogany shrubland; collected here: Cerastium arvense, Lomatium orientale, Amelanchier alnifolia, nearby: Cercocarpus montanus.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Amelanchier alnifolia (Nutt.) Nutt. ex M. Roem.  Saskatoon Serviceberry.

Dakota Ridge, Jefferson County, Colorado. Southern end of the hogback in northernmost Golden, 4.16 km. north northwest of the GNIS location of Golden. 39.7813°N, 105.2375°W. WGS 1984 Elev. 1877 m. Just one shrub, unarmed. Southwest slope. 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.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Bromus tectorum L.  Cheat Grass.

Dakota Ridge, Jefferson County, Colorado. Southern end of the hogback in northernmost Golden, 4.16 km. north northwest of the GNIS location of Golden. 39.7813°N, 105.2374°W. WGS 1984 Elev. 1880 m. Southwest slope, near top of hogback; foothills mountain mahogany shrubland; also collected here: Ribes cereum, Amelanchier alnifolia, Cercocarpus montanus, Potentilla recta, and Viola nuttallii.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Viola nuttallii Pursh.  Nuttall's Violet.

Dakota Ridge, Jefferson County, Colorado. Southern end of the hogback in northernmost Golden, 4.15 km. north northwest of the GNIS location of Golden. 39.7814°N, 105.2374°W. WGS 1984 Elev. 1884 m. All were growing underneath Cercocarpus montanus shrubs. Mixed Foothill Shrubland; also collected here: Ribes cereum, Amelanchier alnifolia, Cercocarpus montanus, Potentilla recta, and Bromus tectorum,

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Ribes cereum Douglas.  Wax Currant.

Dakota Ridge, Jefferson County, Colorado. Southern end of the hogback in northernmost Golden, 4.17 km. north northwest of the GNIS location of Golden. 39.7815°N, 105.2373°W. WGS 1984 Elev. 1882 m. Flowers pink. 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.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Cercocarpus montanus Raf.  Alder-Leaf Mountain Mahogany.

Dakota Ridge, Jefferson County, Colorado. Southern end of the hogback in northernmost Golden, 4.17 km. north northwest of the GNIS location of Golden. 39.7815°N, 105.2373°W. WGS 1984 Elev. 1882 m. In bloom, no fruit yet. Foothills shrubland, primarily C. montanus, with Ribes cereum, Rhus trilobata, and Amelanchier alnifolia, and forbs: Physaria montana, Penstemon virens, and Viola nuttallii,

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Penstemon virens Pennell ex Rydb.  Front Range Beardtongue.

Dakota Ridge, Jefferson County, Colorado. Southern end of the hogback in northernmost Golden, 4.19 km. north northwest of the GNIS location of Golden. 39.7817°N, 105.2372°W. WGS 1984 Elev. 1897 m. Flowers blue. 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.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Physaria montana (A. Gray) Greene.  Mountain Bladderpod.

Dakota Ridge, Jefferson County, Colorado. Southern end of the hogback in northernmost Golden, 4.19 km. north northwest of the GNIS location of Golden. 39.7817°N, 105.2372°W. WGS 1984 Elev. 1897 m. 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.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Physaria montana (A. Gray) Greene.  Mountain Bladderpod.

Dakota Ridge, Jefferson County, Colorado. Southern end of the hogback in northernmost Golden, 4.21 km. north northwest of the GNIS location of Golden. 39.7818°N, 105.2373°W. WGS 1984 Elev. 1898 m. 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.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Chorispora tenella (Pall.) DC.  Crossflower.

North Washington Open Space, Jefferson County, Colorado. Small (4 acre) fallow city-owned parcel in northern Golden, near the intersection of Colorado Highway 93 and Washington Avenue, 2.24 km. northwest of the GNIS location of Golden. 39.7687°N, 105.2318°W. WGS 1984 Elev. 1801 m. Beside the primary east-west social trail, in an area mowed by adjacent private landowners in an effort to widen the social trail. Also collected here: Chenopodium album, Cirsium arvense, Lactuca serriola, and Bromus inermis.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Ranunculus acris L.  Tall Buttercup.

Tucker Gulch (lower), Jefferson County, Colorado. Creekside just below the First Street Bridge, 1.69 km. north northwest of the GNIS location of Golden 39.7665°N, 105.2265°W. WGS 1984 Elev. 1761 m. Rooted in the lowest bank of the creek. Also collected nearby: Chorispora tenella, Euphorbia esula, and Poa bulbosa.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Alopecurus arundinaceus Poir.  Creeping Reed Foxtail.

Tucker Gulch (lower), Jefferson County, Colorado. Creekside just below the First Street Bridge, 1.69 km. north northwest of the GNIS location of Golden 39.7665°N, 105.2265°W. WGS 1984 Elev. 1761 m. Rhizomatous. Rooted in the lowest bank of the creek. Also collected nearby: Chorispora tenella, Euphorbia esula, Ranunculus acris, and Poa bulbosa. Same as Coll. No. 1334, 11 May 2016, made 200 m. upstream.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Lemna minor L.  Common Duckweed.

Tucker Gulch (lower), Jefferson County, Colorado. Running water in a little spring-fed perennial stream tributary to Tucker Gulch, 250 m. upstream of the First Street bridge, 1.98 km. north northwest of the GNIS location of Golden. 39.7682°N, 105.2279°W. WGS 1984 Elev. 1778 m. Also collected nearby: Salix alba, Berteroa incana, Capsella bursa-pastoris, Heterotheca villosa, Poa bulbosa, and Muscari botryoides.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Physaria vitulifera Rydb.  Roundtip Twinpod.

Kinney Run, Jefferson County, Colorado. Near the top of steep sandstone outcrops, east side of Kinney Run, just north of Tripp Ranch, 4.4 km. south of the GNIS location of Golden. 39.726°N, 105.2128°W. WGS 1984 Elev. 1848 m. Basal leaves nearly entire; fruit apical sinus deeper. Common on outcrops of Lykens sandstone. Colorado rare plant: G3/S3: Vulnerable, found locally in a restricted range. Collection made to rule out P. vitulifera × bellii.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Ribes aureum Pursh.  Golden Currant.

Apex Park - Northern Parcel, Jefferson County, Colorado. A northeast corner of the north parcel where several ephemeral streams merge before flowing through the Stonebridge HOA enroute to Kinney Run, 4.45 km. south of the GNIS location of Golden 39.7249°N, 105.2171°W. WGS 1984 Elev. 1845 m. Common here, on the bank of ephemeral stream, with Prunus americana and Prunus virginiana; one frog heard croaking.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Prunus americana Marshall.  American Plum.

Apex Park - Northern Parcel, Jefferson County, Colorado. A northeast corner of the north parcel where several ephemeral streams merge before flowing through the Stonebridge HOA enroute to Kinney Run, 4.45 km. south of the GNIS location of Golden 39.7249°N, 105.2171°W. WGS 1984 Elev. 1848 m. Petals white. Flowers opening as leaves emerge. Common here, on the bank of ephemeral stream, with Ribes aureum and Prunus virginiana; one frog heard croaking.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Potentilla fissa Nutt. ex Torr. & A.Gray.  Bigflower Cinquefoil.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northeast-facing nose of a small ridge, along the east side of the Apex Park - North parcel, 4.61 km. south of the GNIS location of Golden. 39.7238°N, 105.2173°W. WGS 1984 Elev. 1869 m. Petal color yellow. Mixed grass and patches of foothill shrubland, also seen or collected nearby: Rhus trilobata, Cynoglossum officinale, Antennaria parvifolia, Nothocalais cuspidata, and Senecio integerrimus.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Senecio integerrimus Nutt.  Columbia Ragwort.

Apex Park - Northern Parcel, Jefferson County, Colorado. Along the eastern edge of the Apex Park - North parcel, in a little bowl, 4.70 km. south of the GNIS location of Golden. 39.7232°N, 105.2173°W. WGS 1984 Elev. 1866 m. Ray flower color yellow. Mixed grass and foothill shrubland, around the edge of a thicket of Prunus americana and Rhus trilobata. Cynoglossum officinale also here.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Antennaria parvifolia Nutt.  Small-Leaf Pussytoes.

Apex Park - Northern Parcel, Jefferson County, Colorado. Along the eastern edge of the Apex Park - North parcel, open, north-facing aspect, 4.73 km. south of the GNIS location of Golden. 39.723°N, 105.2174°W. WGS 1984 Elev. 1878 m. Disk flower color white. Mixed grass and foothill shrubland, near a thicket of Prunus americana and Rhus trilobata; Senecio integerrimus and Cynoglossum officinale also here.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Nothocalais cuspidata (Pursh) Greene.  Prairie False Dandelion.

Apex Park - Northern Parcel, Jefferson County, Colorado. Along the eastern edge of the Apex Park - North parcel, small, north-facing ridge, 75 m. north of the water tank, 4.81 km. south of the GNIS location of Golden. 39.7224°N, 105.2176°W. WGS 1984 Elev. 1881 m. Ray flower color yellow with reddish tinge abaxially. Among grasses below foothills shrubland; collected nearby: Chorispora tenella, Prunus virginiana, Antennaria parvifolia, and Senecio integerrimus. There were no N. cuspidata to be found in the nearby infestation of smooth brome.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Chorispora tenella (Pall.) DC.  Crossflower.

Apex Park - Northern Parcel, Jefferson County, Colorado. Southeast corner of Apex Park - North parcel, along an ephemeral stream that drains northeastward through Stonebridge HOA to Deadman Gulch, 4.77 km. south of the GNIS location of Golden. 39.7227°N, 105.218°W. WGS 1984 Elev. 1877 M. Petal color magenta. Small patch, collected with Prunus virginiana.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Prunus virginiana L.  Chokecherry.

Apex Park - Northern Parcel, Jefferson County, Colorado. Southeast corner of Apex Park - North parcel, along an ephemeral stream that drains northeastward through Stonebridge HOA to Deadman Gulch, 4.77 km. south of the GNIS location of Golden. 39.7227°N, 105.218°W. WGS 1984 Elev. 1873 m. Petal color white. In the bed of a small ephemeral watercourse.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Rubus deliciosus Torr.  Delicious raspberry.

Apex Park - Northern Parcel, Jefferson County, Colorado. Southeast quadrant of the north parcel of Apex Park, 4.76 km. south of the GNIS location of Golden 39.7229°N, 105.2189°W. WGS 1984 Elev. 1882 m. Petal color white. Northeast-facing slope beside ravine, surrounded by Rhus trilobata.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Dodecatheon pulchellum (Raf.) Merr.  Beautiful Shootingstar.

Apex Park - Northern Parcel, Jefferson County, Colorado. Lower part of Front Range scarp, approximate center of eastern quadrant of the Apex Park - North parcel, near the junction of two small ephemeral streams, 4.72 km. south of the GNIS location of Golden 39.723°N, 105.2192°W. WGS 1984 Elev. 1877 m. Petal color magenta. Wet soil, north to northeast-facing slope; also seen or collected here: Holodiscus dumosus, Rubus deliciosus, Toxicodendron rydbergii, Scrophularia lanceolata,

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Mertensia lanceolata (Pursh) DC.  Prairie Bluebells.

South Valley Park, Jefferson County, Colorado. Between the Coyote Song Trail and the sandstone cliffs on the east side of the park, 4.81 km. west northwest of Chatfield Farms, Denver Botanic Garden. 39.5583°N, 105.1418°W. WGS 1984 Elev. 1821 m. Flowers pale blue. Also collected here: Quercus gambelii, Scutellaria brittonii, Collinsia parviflora, and Toxicoscordion paniculatum.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Scutellaria brittonii Porter.  Britton's Skullcap.

South Valley Park, Jefferson County, Colorado. Between the Coyote Song Trail and the sandstone cliffs on the east side of the park, 4.81 km. west northwest of Chatfield Farms, Denver Botanic Garden. 39.5584°N, 105.1415°W. WGS 1984 Elev. 1826 m. Openings in Gambel oaks. Also collected here: Quercus gambelii, Mertensia lanceolata, Collinsia parviflora, and Toxicoscordion paniculatum.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Claytonia rubra (T. J. Howell) Tidestrom.  Red-Stem Springbeauty.

South Valley Park, Jefferson County, Colorado. Between the Coyote Song Trail and the sandstone cliffs on the east side of the park, 4.81 km. west northwest of Chatfield Farms, Denver Botanic Garden. 39.5584°N, 105.1415°W. WGS 1984 Elev. 1826 m. Openings in Gambel oaks. Also collected here: Quercus gambelii, Mertensia lanceolata, Scutellaria brittonii, Collinsia parviflora, and Toxicoscordion paniculatum.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Townsendia grandiflora Nutt.  Largeflower Townsend Daisy.

South Valley Park, Jefferson County, Colorado. Between the Coyote Song Trail and the sandstone cliffs on the east side of the park, 4.66 km. west northwest of Chatfield Farms, Denver Botanic Garden. 39.5579°N, 105.1407°W. WGS 1984 Elev. 1835 m. Stiff sandstone-derived soil below cliffs, nearly bare of vegetation. Nearby: Quercus gambelii, Cryptantha virgata, Lappula occidentalis, Mertensia lanceolata, Collinsia parviflora, and Toxicoscordion paniculatum.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Physaria X1.  Twinpod Hybrid.

South Valley Park, Jefferson County, Colorado. Between the Coyote Song Trail and the sandstone cliffs on the east side of the park, 4.66 km. west northwest of Chatfield Farms, Denver Botanic Garden. 39.5579°N, 105.1407°W. WGS 1984 Elev. 1835 m. Stiff sandstone-derived soil below cliffs, nearly bare of vegetation. Nearby: Quercus gambelii, Cryptantha virgata, Lappula occidentalis, Mertensia lanceolata, Collinsia parviflora, and Toxicoscordion paniculatum.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Linaria dalmatica (L.) Mill.  Dalmatian ToadFlax.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, north side of Deadman Gulch, right at the base of the Front Range scarp, 4.06 km. south of the GNIS location of Golden 39.7276°N, 105.2228°W. WGS 1984 Elev. 1893 m. Flowers yellow. Also seen or collected here: Juniperus scopulorum, Oenothera suffrutencens, Cynoglossum officinale, and Agoseris parviflora.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Cynoglossum officinale L.  Gypsyflower.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, north side of Deadman Gulch, right at the base of the Front Range scarp, 4.06 km. south of the GNIS location of Golden. 39.7276°N, 105.2228°W. WGS 1984 Elev. 1897 m. Basal leaves withered. Flowers red, fading purple. Also seen or collected here: Juniperus scopulorum, Oenothera suffrutencens, Linaria dalmatica, and Agoseris parviflora. Colorado Noxious Weed List B.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Agoseris parviflora (Nutt.) D. Dietr.  Steppe Goat-Chicory.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, north side of Deadman Gulch, right at the base of the Front Range scarp, 4.06 km. south of the GNIS location of Golden. 39.7276°N, 105.2227°W. WGS 1984 Elev. 1900 m. Leaves runcinate. Flowers yellow. Also seen or collected here: Juniperus scopulorum, Oenothera suffrutescens, Linaria dalmatica, and Cynoglossum officinale.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Tradescantia occidentalis (Britton) Smyth.  Prairie Spiderwort.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, steep slope part way up the initial Front Range scarp, 4.08 km. south of the GNIS location of Golden 39.7274°N, 105.2237°W. WGS 1984 Elev. 1934 m. These flowers very intense purplish-blue color. Open southeast-facing slopes.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Turritis glabra L. [Arabis glabra (L.) Bernh.]  Tower Rockcress.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, steep slope part way up the initial Front Range scarp, 4.08 km. south of the GNIS location of Golden 39.7274°N, 105.2237°W. WGS 1984 Elev. 1934 m. Open southeast-facing slopes. Also collected here: Tradescantia occidentalis.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Sisymbrium altissimum L.  Tall Tumblemustard.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, steep slope part way up the initial Front Range scarp, 4.08 km. south of the GNIS location of Golden 39.7275°N, 105.2237°W. WGS 1984 Elev. 1932 m. Open southeast-facing slopes. Also collected here: Tradescantia occidentalis and Turritis glabra.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Erigeron tracyi Greene.  Running Fleabane.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, steep slope part way up the initial Front Range scarp, just north of a small spring, 4.03 km. south of the GNIS location of Golden 39.7278°N, 105.2237°W. WGS 1984 Elev. 1933 m. Heads solitary on (nearly) leafless stems. Also seen or collected nearby: Juniperus scopulorum, Eriogonum alatum, Turritis glabra, Physalis hederifolia, and Scorzonera laciniata. Thought to be an stable apomictic hybrid of E flagellaris and E. diverngens (FNANM) and is the most common of the three taxa in Golden and vicinity.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Scorzonera laciniata L.  Cutleaf Vipergrass.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, steep slope part way up the initial Front Range scarp, shaded spot between junipers, beside a small trickle of water from a spring, 4.03 km. south of the GNIS location of Golden 39.7278°N, 105.2237°W. WGS 1984 Elev. 1933 m. Also seen or collected nearby: Juniperus scopulorum, Eriogonum alatum, Turritis glabra, Physalis hederifolia, and Erigeron tracyi.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Castilleja integra A. Gray.  Wholeleaf Indian Paintbrush.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, steep slope part way up the initial Front Range scarp, along the edge of an old road, now an elk trail, 4.02 km. south of the GNIS location of Golden 39.7279°N, 105.2243°W. WGS 1984 Elev. 1952 m. Large specimens with brilliant red color. Also collected nearby: Penstemon secundiflorus, Erigeron tracyi, Scorzonera laciniata, and Allium textile.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Galium aparine L.  Sticky Willy, Cleavers.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, steep slope part way up the initial Front Range scarp, along the edge of an old road, now an elk trail, 4.02 km. south of the GNIS location of Golden 39.7279°N, 105.2243°W. WGS 1984 Annuals. Also collected nearby: Penstemon secundiflorus, Castilleja integra, Erigeron tracyi, Scorzonera laciniata, and Allium textile.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Alyssum simplex Rudolphi.  European Madwort.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, steep slope part way up the initial Front Range scarp, along the edge of an old road, now an elk trail, 4.02 km. south of the GNIS location of Golden 39.7279°N, 105.2243°W. WGS 1984 Annuals. Also collected nearby: Penstemon secundiflorus, Castilleja integra, Erigeron tracyi, Scorzonera laciniata, and Allium textile.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Penstemon secundiflorus Benth.  Sidebells Penstemon.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, steep slope part way up the initial Front Range scarp, along the edge of an old road, now an elk trail, 3.99 km. south of the GNIS location of Golden 39.7281°N, 105.2247°W. WGS 1984 Elev. 1964 m. Corolla pinkish when fresh, fading bluish. Also collected nearby: Alyssum simplex, Castilleja integra, Erigeron tracyi, Scorzonera laciniata, and Allium textile.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Allium textile A. Nelson & J.F. Macbr.  Textile Onion.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, steep slope part way up the initial Front Range scarp, along the edge of an old road, now an elk trail, 3.99 km. south of the GNIS location of Golden 39.7282°N, 105.2247°W. WGS 1984 Elev. 1967 m. East-facing slope in deep forest duff under Cercocarpus montanus and Pinus ponderosa.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Penstemon virens Pennell ex Rydb.  Front Range Beardtongue.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, north side of Deadman Gulch, on the nose of a small promontory overlooking the cliffs on the south side, 4.19 km. south southwest of the GNIS location of Golden. 39.7267°N, 105.225°W. WGS 1984 Elev. 2014 m. Dry, rocky site under scattered ponderosa pine; also here: Physaria montana and Campanula rotundifolia.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Poa fendleriana (Steud.) Vasey.  Muttongrass.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, north side of Deadman Gulch, on the nose of a small promontory overlooking the cliffs on the south side, 4.19 km. south southwest of the GNIS location of Golden. 39.7268°N, 105.225°W. WGS 1984 Elev. 2014 m. Dry, rocky site under scattered ponderosa pine; also here: Physaria montana, Campanula rotundifolia, and Penstemon virens.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Physaria montana (A. Gray) Greene.  Mountain Bladderpod.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, north side of Deadman Gulch, in a small saddle near the top of the initial Rocky Mountain Front Range scarp, 4.14 km. south southwest of the GNIS location of Golden 39.7272°N, 105.2252°W. WGS 1984 Elev. 2011 m. Among ponderosa pine and Rocky Mountain juniper; also collected here: Harbouria trachypleura and Erysimum capitatum.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Erysimum capitatum (Hook.) Greene.  Sanddune Wallflower.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, north side of Deadman Gulch, in a small saddle near the top of the initial Rocky Mountain Front Range scarp, 4.14 km. south southwest of the GNIS location of Golden 39.7271°N, 105.2253°W. WGS 1984 Elev. 2020 m. Under a Rocky Mountain juniper among ponderosa pines; also collected here: Harbouria trachypleura and Physaria montana.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Harbouria trachypleura (A. Gray) J.M. Coult. & Rose.  Whiskbroom Parsley.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost quadrant of the parcel, north side of Deadman Gulch, in a small saddle near the top of the initial Rocky Mountain Front Range scarp, 4.14 km. south southwest of the GNIS location of Golden 39.7271°N, 105.2253°W. WGS 1984 Elev. 2020 m. Small opening among Rocky Mountain junipers and ponderosa pines; also collected here: Erysimum capitatum and Physaria montana.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Cynoglossum officinale L.  Gypsyflower.

Clear Creek Canyon Park, Jefferson County, Colorado. Along the former Welch Ditch, in shade inside the ditch, south side of Clear Creek, just inside the mouth of Clear Creek Canyon, 2.73 km. west southwest of the GNIS location of Golden. 39.7515°N, 105.2451°W. WGS 1984 Elev. 1768 m. Also colleted here: Scrophularia lanceolata, Bromus tectorum, and Dactylis glomerata. Popular rock-climbing area with heavy daily use. Colorado Noxious Weed List B.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Scrophularia lanceolata Pursh.  Lanceleaf Figwort.

Clear Creek Canyon Park, Jefferson County, Colorado. Along the former Welch Ditch, in shade inside the ditch, south side of Clear Creek, just inside the mouth of Clear Creek Canyon, 2.73 km. west southwest of the GNIS location of Golden. 39.7515°N, 105.2451°W. WGS 1984 Elev. 1774 m. Also colleted here: Cynoglossum officinale, Bromus tectorum, and Dactylis glomerata. Popular rock-climbing area with heavy daily use.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Dactylis glomerata L.  Orchard Grass.

Clear Creek Canyon Park, Jefferson County, Colorado. Along the former Welch Ditch, at the base of aqueduct walls, south side of Clear Creek, just inside the mouth of Clear Creek Canyon, 2.69 km. west southwest of the GNIS location of Golden. 39.7517°N, 105.2448°W. WGS 1984 Elev. 1781 m. Also colleted here: Cynoglossum officinale, Scrophularia lanceolata, and Bromus tectorum. Not a listed Colorado noxious weed.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Bromus tectorum L.  Cheat Grass.

Clear Creek Canyon Park, Jefferson County, Colorado. Along the former Welch Ditch, in shade at the base of aqueduct walls, south side of Clear Creek, just inside the mouth of Clear Creek Canyon, 2.71 km. west southwest of the GNIS location of Golden. 39.7517°N, 105.2449°W. WGS 1984 Elev. 1781 m. Also colleted here: Cynoglossum officinale, Scrophularia lanceolata, and Dactylis glomerata. Popular rock-climbing area with heavy daily use. Colorado Noxious Weed List C.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Jamesia americana Torr. & A. Gray.  Fivepetal Cliffbush.

Clear Creek Canyon Park, Jefferson County, Colorado. Along the former Welch Ditch, south side of Clear Creek, growing in rocks above the ditch, barely reachable, more on slope above, just inside the mouth of Clear Creek Canyon, 2.59 km. west southwest of the GNIS location of Golden. 39.7522°N, 105.244°W. WGS 1984 Elev. 1780 m. Collected nearby: Aletes acaulis, Sedum lanceolatum, Eriogonum umbellatum, Acer glabrum, and Koeleria macrantha. Popular rock-climbing area with heavy daily use.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Eriogonum umbellatum Torr. var. umbellatum.  Sulphur-Flower Buckwheat.

Clear Creek Canyon Park, Jefferson County, Colorado. Along the former Welch Ditch, south side of Clear Creek, growing in rocks on slope above the ditch, just inside the mouth of Clear Creek Canyon, 2.58 km. west southwest of the GNIS location of Golden. 39.7522°N, 105.2438°W. WGS 1984 Elev. 1788 m. Also collected here: Aletes acaulis, Comandra umbellata subsp. pallida, Physocarpus monogynus, and Sedum lanceolatum. Popular rock-climbing area with heavy daily use.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Physocarpus monogynus (Torr.) J.M. Coult.  Mountain Ninebark.

Clear Creek Canyon Park, Jefferson County, Colorado. Along the former Welch Ditch, south side of Clear Creek, growing in rocks on slope above the ditch, just inside the mouth of Clear Creek Canyon, 2.58 km. west southwest of the GNIS location of Golden. 39.7522°N, 105.2438°W. WGS 1984 Elev. 1788 m. Also collected here: Aletes acaulis, Comandra umbellata subsp. pallida, Eriogonum umbellatum var. umbellatum, and Sedum lanceolatum. Popular rock-climbing area with heavy daily use.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Sedum lanceolatum Torr.  Spearleaf Stonecrop.

Clear Creek Canyon Park, Jefferson County, Colorado. Along the former Welch Ditch, south side of Clear Creek, growing in rocks on slope above the ditch, just inside the mouth of Clear Creek Canyon, 2.58 km. west southwest of the GNIS location of Golden. 39.7522°N, 105.2438°W. WGS 1984 Elev. 1788 m. Also collected here: Aletes acaulis, Comandra umbellata subsp. pallida, Eriogonum umbellatum var. umbellatum, and Physocarpus monogynus. Popular rock-climbing area with heavy daily use.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Aletes acaulis (Torr.) J.M. Coult. & Rose.  Stemless Indian Parsley.

Clear Creek Canyon Park, Jefferson County, Colorado. Along the former Welch Ditch, south side of Clear Creek, growing in rocks on slope above the ditch, just inside the mouth of Clear Creek Canyon, 2.58 km. west southwest of the GNIS location of Golden. 39.7522°N, 105.2438°W. WGS 1984 Elev. 1788 m. Also collected here: Sedum lanceolatum, Comandra umbellata subsp. pallida, Eriogonum umbellatum var. umbellatum, and Physocarpus monogynus. Popular rock-climbing area with heavy daily use.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Comandra umbellata (L.) Nutt. ssp. pallida (A. DC.) Piehl.  Pale Bastard Toadflax.

Clear Creek Canyon Park, Jefferson County, Colorado. Along the former Welch Ditch, south side of Clear Creek, growing in rocks on slope above the ditch, just inside the mouth of Clear Creek Canyon, 2.58 km. west southwest of the GNIS location of Golden. 39.7522°N, 105.2438°W. WGS 1984 Elev. 1788 m. Also collected here: Sedum lanceolatum, Aletes acaulis, Eriogonum umbellatum var. umbellatum, and Physocarpus monogynus. Popular rock-climbing area with heavy daily use.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Acer glabrum Torr.  Rocky Mountain Maple.

Clear Creek Canyon Park, Jefferson County, Colorado. Along the former Welch Ditch, south side of Clear Creek, growing in rocks on slope just below the ditch, just inside the mouth of Clear Creek Canyon, 2.55 km. west southwest of the GNIS location of Golden. 39.7523°N, 105.2436°W. WGS 1984 Elev. 1776 m. Also collected here and nearby: Jamesia americana, Physocarpus monogynus, and Koeleria macrantha. Popular rock-climbing area with heavy daily use.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Koeleria macrantha (Ledeb.) Schult.  Prairie Junegrass.

Clear Creek Canyon Park, Jefferson County, Colorado. Along the former Welch Ditch, south side of Clear Creek, growing in rocks and concrete on the edge of the ditch, just inside the mouth of Clear Creek Canyon, 2.55 km. west southwest of the GNIS location of Golden. 39.7523°N, 105.2436°W. WGS 1984 Elev. 1775 m. Few plants here; clumped, not rhizomatous. Popular rock-climbing area with heavy daily use.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Cotoneaster lucidus Schltdl.  Hairy Stem Cotoneaster.

Welch Ditch, Jefferson County, Colorado. Along the former Welch Ditch, south side of Clear Creek, in a small gulch south of and above the ditch, just inside the mouth of Clear Creek Canyon, 2.37 km. west southwest of the GNIS location of Golden. 39.752°N, 105.2419°W. WGS 1984 Elev. 1779 m. Plants first recognized in the field by Cindy Trujillo.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Hesperis matronalis L.  Dame's Rocket.

Clear Creek Canyon Park, Jefferson County, Colorado. Inside the former Welch Ditch, south side of Clear Creek, just inside the mouth of Clear Creek Canyon, 2.26 km. west southwest of the GNIS location of Golden. 39.7521°N, 105.2409°W. WGS 1984 Elev. 1777 m. Two plants, both collected. Colorado Noxious Weed List B.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Silene latifolia Poir.  Bladder Campion.

Welch Ditch, Jefferson County, Colorado. Inside and beside the former Welch Ditch, south side of Clear Creek, just inside the mouth of Clear Creek Canyon, 2.19 km. west southwest of the GNIS location of Golden. 39.7519°N, 105.2402°W. WGS 1984 Elev. 1774 m. Flowers white, imperfect.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Holodiscus dumosus (Nutt. ex Torr. & A.Gray) A.Heller.  Rock Spirea.

Clear Creek Canyon Park, Jefferson County, Colorado. Steep slopes above and below the former Welch Ditch, south side of Clear Creek, just inside the mouth of Clear Creek Canyon, 1.87 km. west southwest of the GNIS location of Golden. 39.7515°N, 105.237°W. WGS 1984 Elev. 1777 m. In bud, no flowers.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Evolvulus nuttallianus Roem. & Schult.  Shaggy Dwarf Morning Glory.

North Washington Open Space, Jefferson County, Colorado. Top of hill, north side of social trail. 39.7686°N, 105.2332°W. WGS 1984 Elev. 1819 m. Two plants, twelve stems total; two stems collected. Flowers blue, fading darker.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Linum lewisii Pursh.  Prairie Blue Flax.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost part of Apex Park, northeast corner, in grasslands on alluvial terrace just below foothill shrublands and the Rocky Mountain foothills scarp, 4.04 km. south of the GNIS location of Golden. 39.7277°N, 105.2218°W. WGS 1984 Elev. 1880 m. Homostylous. Also collected here: Ribes cereum, Prunus virginuana, Astragalus flexuosus, Lupinus argenteus, Bromus japonicus, and Nassella viridula.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Lupinus argenteus Pursh var. argenteus.  Loosely Flowered Silver Lupine.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost part of Apex Park, northeast corner, in grasslands on alluvial terrace just below foothill shrublands and the Rocky Mountain foothills scarp, 4.06 km. south of the GNIS location of Golden. 39.7275°N, 105.222°W. WGS 1984 Elev. 1884 m. Basal leaves absent, banner back glabrous, banner recurved 4 mm. from apex. Also collected here: Ribes cereum, Prunus virginuana, Astragalus flexuosus, Linum lewisii, Bromus japonicus, and Nassella viridula.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Astragalus flexuosus G. Don.  Flexible Milkvetch.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost part of Apex Park, northeast corner, in grasslands on alluvial terrace just below foothill shrublands and the Rocky Mountain foothills scarp, 4.03 km. south of the GNIS location of Golden. 39.7277°N, 105.2219°W. WGS 1984 Elev. 1882 m. Leaves cauline. Also collected here: Ribes cereum, Prunus virginuana, Lupinus argenteus, Linum lewisii, Bromus japonicus, and Nassella viridula.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Bromus japonicus Thunb.  Japanese Cheat Grass.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost part of Apex Park, northeast corner, in grasslands on alluvial terrace just below foothill shrublands and the Rocky Mountain foothills scarp, 4.03 km. south of the GNIS location of Golden. 39.7276°N, 105.2219°W. WGS 1984 Elev. 188 m. With B. tectorum which it follows by 1 or 2 weeks. Also collected here: Ribes cereum, Prunus virginuana, Astragalus flexuosus, Lupinus argenteus, Linum lewisii, and Nassella viridula.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Nassella viridula (Trin.) Barkworth.  Green Needlegrass.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost part of Apex Park, northeast corner, in grasslands on alluvial terrace just below foothill shrublands and the Rocky Mountain foothills scarp, 4.07 km. south of the GNIS location of Golden. 39.7274°N, 105.2217°W. WGS 1984 Elev. 1882 m. Also collected here: Ribes cereum, Prunus virginuana, Astragalus flexuosus, Lupinus argenteus, Linum lewisii, and Bromus japonicus.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Erigeron tracyi Greene.  Running Fleabane.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost part of Apex Park, northeast corner, in grasslands on alluvial terrace just below foothill shrublands and the Rocky Mountain foothills scarp, 4.09 km. south of the GNIS location of Golden. 39.7273°N, 105.2217°W. WGS 198 Elev. 1882 m. Also collected nearby: Ribes cereum, Prunus virginuana, Astragalus flexuosus, Lupinus argenteus, Linum lewisii, Bromus japonicus, and Nassella viridula.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Potentilla recta L.  Sulphur Cinquefoil.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost part of Apex Park, northeast corner, at the base of the Rocky Mountain foothills scarp, 4.10 km. south of the GNIS location of Golden. 39.7272°N, 105.2219°W. WGS 1984 Elev. 1879 m. Mixed foothills shrub- and grassland. Also collected here: Erigeron tracyi, and Nassella viridula. Colorado Noxious Weed List B.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Oenothera suffrutescens (Ser.) W. L. Wagner & Hoch.  Linda Tarde.

Apex Park - Northern Parcel, Jefferson County, Colorado. Northernmost part of Apex Park, along the east boundary, near base of the Rocky Mountain foothills scarp, 4.23 km. south of the GNIS location of Golden 39.7263°N, 105.2217°W. WGS 1984 Elev. 1890 m. A little bedraggled from last week's record high temperature, but also slightly revived by yesterday's 0.29 in. of rain. Mostly foothills shrubland with grasses, also collected nearby: Arctium minus, Verbascum thapsus, Cynoglossum officinale, and Mondarda fistulosa.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Delphinium carolinianum Walter ssp. virescens (Nutt.) R.E. Brooks.  Plains Larkspur.

Apex Park - Northern Parcel, Jefferson County, Colorado. Towards the middle of the Apex Park north parcel, lower portion of Rocky Mountains foothill scarp, on a small rocky promontory overlooking an unnamed gulch, 4.39 km. south of the GNIS location of Golden 39.7252°N, 105.2217°W. WGS 1984 Elev. 1916 m. Southeast facing rocky slope, with Rhus trilobata, Heterotheca villosa, Aristida purpurea, and Bromus tectorum.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Monarda pectinata Nutt.  Plains Beebalm.

Apex Park - Northern Parcel, Jefferson County, Colorado. Towards the middle of the Apex Park north parcel, lower portion of Rocky Mountains foothill scarp, on a small rocky promontory overlooking an unnamed gulch, 4.39 km. south of the GNIS location of Golden. 39.7252°N, 105.2217°W. WGS 1984 Elev. 1919 m. Flowers light pink, darker at lower lip. Southeast facing rocky slope, with Rhus trilobata, Heterotheca villosa, Aristida purpurea, and Bromus tectorum.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Secale cereale L.  Cereal Rye.

Cressmans Gulch (lower), Jefferson County, Colorado. 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. 39.7831°N, 105.2396°W. WGS 1984 Elev. 1870 m. Not rhizomatous, bi-lateral spike, two florets per spikelet, lemma asymetrical and keel ciliate. Also collected here: Poa secunda, Linum lewisii, and Lupinus argenteus.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Poa pratensis L.  Kentucky Bluegrass.

Cressmans Gulch (lower), Jefferson County, Colorado. 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. 39.7832°N, 105.2396°W. WGS 1984 Elev. 1871 m. Slender rhizomes, lemma with cobwebby hairs. Also collected here: Secale cereale, Linum lewisii, and Lupinus argenteus.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Lithospermum cf. arvense L.  Corn Gromwell.

Cressmans Gulch (lower), Jefferson County, Colorado. 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. 39.7832°N, 105.2396°W. WGS 1984 Elev. 1871 m. Fruit, no flowers. Definitely 4 nutlets, but without prickles, etc. Also collected here: Poa pratensis, Secale cereale, Linum lewisii, and Lupinus argenteus.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Lupinus argenteus Pursh var. argenteus.  Loosely Flowered Silver Lupine.

Cressmans Gulch (lower), Jefferson County, Colorado. 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. 39.7829°N, 105.2394°W. WGS 1984 Elev. 1867 m. Basal leaves absent. Banner back and keel glabrous. Also collected here: Poa pratensis, Secale cereale, Linum lewisii, and Lithospermum arvense.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Linum lewisii Pursh.  Prairie Blue Flax.

Dakota Ridge, Jefferson County, Colorado. 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. 39.783°N, 105.2393°W. WGS 1984 Elev. 1870 m. Homostylous. Also collected here: Poa pratensis, Secale cereale, Lupinus argenteus, and Lithospermum arvense.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Helianthus pumilus Nutt.  Little Sunflower.

Dakota Ridge, Jefferson County, Colorado. 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. 39.7831°N, 105.2381°W. WGS 198 Elev. 1901 m. Also collected here: Bromus japonicus, and Nassella viridula, and nearby: Hypericum perforatum, Potentilla recta, and Muhlenbergia montana.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Bromus japonicus Thunb.  Japanese Cheat Grass.

Dakota Ridge, Jefferson County, Colorado. 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. 39.7831°N, 105.2381°W. WGS 1984 Elev. 1903 m. Widely distributed on this slope, phenology following Bromus tectorum by about two weeks. Also collected here: Helianthus pumilis, and Nassella viridula, and nearby: Hypericum perforatum, Potentilla recta, and Muhlenbergia montana.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Gaillardia aristata Pursh.  Blanketflower.

Dakota Ridge, Jefferson County, Colorado. 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. 39.7831°N, 105.2378°W. WGS 1984 Elev. 1916 m. Foothills shrubland, mostly Cercocarpus montanus; also collected here: Hypericum perforatum; nearby: Campanula rotundifolia, and Muhlenbergia montana.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Hypericum perforatum L.  Common St. John's Wort.

Dakota Ridge, Jefferson County, Colorado. 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. 39.783°N, 105.2378°W. WGS 1984 Elev. 1916 m. Foothills shrubland, mostly Cercocarpus montanus; also collected here: Gaillardia aristata; nearby: Campanula rotundifolia, and Muhlenbergia montana.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Eriogonum umbellatum Torr. var. umbellatum.  Sulphur-Flower Buckwheat.

Dakota Ridge, Jefferson County, Colorado. 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. 39.783°N, 105.2376°W. WGS 1984 Elev. 1926 m. Open herbaceous vegetation, ponderosa pines and mountan mahogany shrubland nearby. Also collected here: Heterotheca villosa, Hesperostipa comata, and Koeleria macrantha.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Koeleria macrantha (Ledeb.) Schult.  Prairie Junegrass.

Dakota Ridge, Jefferson County, Colorado. 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. 39.783°N, 105.2376°W. WGS 1984 Elev. 1927 m. Open herbaceous vegetation, ponderosa pines and mountain mahogany shrubland nearby. Also collected here: Heterotheca villosa, Hesperostipa comata, and Eriogonum umbellatum var. umbellatum.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Heterotheca villosa (Pursh) Shinners.  Hairy False Goldenaster.

Dakota Ridge, Jefferson County, Colorado. 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. 39.783°N, 105.2376°W. WGS 1984 Elev. 1930 m. Open herbaceous vegetation, ponderosa pines and mountain mahogany shrubland nearby. Also collected here: Koeleria macrantha, Hesperostipa comata, and Eriogonum umbellatum var. umbellatum.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Delphinium carolinianum Walter ssp. virescens (Nutt.) R.E. Brooks.  Plains Larkspur.

Dakota Ridge, Jefferson County, Colorado. 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. 39.7828°N, 105.2379°W. WGS 1984 Elev. 1912 m. Within a band of foothills mountain mahogany shrubland likely aligned with underlying strata; collected nearby: Potentilla recta and Muhlenbergia montana.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Melilotus officinalis (L.) Lam.  Yellow Sweet Clover.

Cressmans Gulch (lower), Jefferson County, Colorado. 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. 39.7827°N, 105.2393°W. WGS 1984 Elev. 1872 m. Grassy bank of gulch, also seen or collected here: Rumex acetosella, Linum lewisii, Lupinus argenteus, and Thelesperma megapotamicum.

Collected by permit: City of Golden, 2020, issued: Apr 9, 2020, to: Tom Schweich.

Lupinus argenteus Pursh var. argenteus.  Loosely Flowered Silver Lupine.

Colorado School of Mines Survey Field, Jefferson County, Colorado. Southernmost edge of the Survey Field, adjacent to Stonebridge HOA lands, high plains at the base of the Rocky Mountain Front Range, 3.27 km. south of the GNIS location of Golden. 39.733°N, 105.2215°W. WGS 1984 Elev. 1827 m. Basal leaves 0, flowers blue to lavender. Mixed foothills shrubs and grasses, also seen or collected here: Toxicodendron rydbergii, Symphoricarpos rotundifolius, Senecio integerrimus, and Bromus japonicus.

Collected by permit: Colorado School of Mines, 2020, issued: Apr 1, 2020, to: Tom Schweich.

Bromus secalinus L.  Chess.

Colorado School of Mines Survey Field, Jefferson County, Colorado. Southernmost edge of the Survey Field, adjacent to Stonebridge HOA lands, high plains at the base of the Rocky Mountain Front Range, 3.27 km. south of the GNIS location of Golden. 39.7329°N, 105.2215°W. WGS 1984 Elev. 1824 m. Larger than Bromus japonicus, growing around a pile of rocks. Mixed foothills shrubs and grasses, also seen or collected here: Toxicodendron rydbergii, Symphoricarpos rotundifolius, Senecio integerrimus, and Lupinus argenteus.

Collected by permit: Colorado School of Mines, 2020, issued: Apr 1, 2020, to: Tom Schweich.

Bromus secalinus L.  Chess.

Colorado School of Mines Survey Field, Jefferson County, Colorado. Southernmost edge of the Survey Field, adjacent to Stonebridge HOA lands, high plains at the base of the Rocky Mountain Front Range, 3.27 km. south of the GNIS location of Golden. 39.7329°N, 105.2215°W. WGS 1984 Elev. 1824 m. Same as Coll. No. 2362, except smut infested. Mixed foothills shrubs and grasses, also seen or collected here: Toxicodendron rydbergii, Symphoricarpos rotundifolius, Senecio integerrimus, and Lupinus argenteus.

Collected by permit: Colorado School of Mines, 2020, issued: Apr 1, 2020, to: Tom Schweich.

Symphoricarpos rotundifolius A. Gray.  Roundleaf Snowberry.

Colorado School of Mines Survey Field, Jefferson County, Colorado. Southernmost edge of the Survey Field, adjacent to Stonebridge HOA lands, high plains at the base of the Rocky Mountain Front Range, 3.26 km. south of the GNIS location of Golden. 39.733°N, 105.2213°W. WGS 1984 Elev. 1826 m. Around the edges of a larger group of Rhus trilobata. Mixed foothills shrubs and grasses, also seen or collected here: Toxicodendron rydbergii, Bromus secalinus, Senecio integerrimus, and Lupinus argenteus.

Collected by permit: Colorado School of Mines, 2020, issued: Apr 1, 2020, to: Tom Schweich.

Rosa acicularis Lindl. ssp. sayi (Schwein.) W. H. Lewis.  Say's Acicular Rose.

Colorado School of Mines Survey Field, Jefferson County, Colorado. Southernmost edge of the Survey Field, adjacent to Stonebridge HOA lands, high plains at the base of the Rocky Mountain Front Range, 3.27 km. south of the GNIS location of Golden. 39.733°N, 105.2215°W. WGS 1984 Elev. 1828 m. Mixed foothills shrubs and grasses, also seen or collected here: Toxicodendron rydbergii, Bromus secalinus, Senecio integerrimus, and Lupinus argenteus.

Collected by permit: Colorado School of Mines, 2020, issued: Apr 1, 2020, to: Tom Schweich.

Castilleja integra A. Gray.  Wholeleaf Indian Paintbrush.

Colorado School of Mines Survey Field, Jefferson County, Colorado. Southern part of the Survey Field, high plains at the base of the Rocky Mountain Front Range, 3.23 km. south of the GNIS location of Golden 39.7332°N, 105.2219°W. WGS 198 Elev. 1833 m. A rather large, robust clump. Nearby shrubs or forbs are Rhus trilobata, Lupinus argentea, and Rosa acicularis var. sayi. Nearest Artemisia, in this case A. ludoviciana, is quite small and some distance away.

Collected by permit: Colorado School of Mines, 2020, issued: Apr 1, 2020, to: Tom Schweich.

Geranium caespitosum James.  Pineywoods Geranium.

Colorado School of Mines Survey Field, Jefferson County, Colorado. Southern part of the Survey Field, high plains at the base of the Rocky Mountain Front Range, 3.23 km. south of the GNIS location of Golden 39.7333°N, 105.2218°W. WGS 1984 Elev. 1832 m. Basal leaves withering. Nearby shrubs or forbs are Rhus trilobata, Lupinus argentea, and Rosa acicularis var. sayi. Also collected here: Castilleja integra and Lithospermum incisum.

Collected by permit: Colorado School of Mines, 2020, issued: Apr 1, 2020, to: Tom Schweich.

Helianthus pumilus Nutt.  Little Sunflower.

Colorado School of Mines Survey Field, Jefferson County, Colorado. Southern part of the Survey Field, high plains at the base of the Rocky Mountain Front Range, 3.18 km. south of the GNIS location of Golden 39.7336°N, 105.2227°W. WGS 1984 Elev. 1841 m. Foothills grassland below shrubland; also here: Astragalus crassicarpus, Heterotheca villosa, and Hymenopappus filifolius.

Collected by permit: Colorado School of Mines, 2020, issued: Apr 1, 2020, to: Tom Schweich.

Hymenopappus filifolius Hook. var. polycephalus (Osterh.) B.L. Turner.  Many-Headed Fine-Leaved Wooly-White.

Colorado School of Mines Survey Field, Jefferson County, Colorado. Southern part of the Survey Field, high plains at the base of the Rocky Mountain Front Range, 3.16 km. south of the GNIS location of Golden 39.7338°N, 105.2228°W. WGS 198 Elev. 1844 m. East-facing slope with low forbs and grasses in foothills grassland below shrubland; also collected here: Astragalus crassicarpus, Helianthus pumilus, and Heterotheca villosa.

Collected by permit: Colorado School of Mines, 2020, issued: Apr 1, 2020, to: Tom Schweich.

Cirsium undulatum (Nutt.) Spreng.  Wavy Leaved Thistle.

Colorado School of Mines Survey Field, Jefferson County, Colorado. Southern part of the Survey Field, high plains at the base of the Rocky Mountain Front Range, 3.15 km. south of the GNIS location of Golden. 39.7339°N, 105.2232°W. WGS 1984 Elev. 1850 m. Northeast-facing gentle slope in foothills grassland, also collected or seen nearby: Opuntia macrorhiza, Hymenopappus filifolius, Aegilops cylindrica, and Poa bulbosa. The common native thistle in Jefferson County, Colorado.

Collected by permit: Colorado School of Mines, 2020, issued: Apr 1, 2020, to: Tom Schweich.

Opuntia macrorhiza Engelm.  Western Pricklypear.

Colorado School of Mines Survey Field, Jefferson County, Colorado. Southern part of the Survey Field, high plains at the base of the Rocky Mountain Front Range, 3.14 km. south of the GNIS location of Golden. 39.7339°N, 105.2234°W. WGS 1984 Elev. 1846 m. Northeast-facing gentle slope in foothills grassland, also collected or seen nearby: Cirsium undulatum, Hymenopappus filifolius, Aegilops cylindrica, and Poa bulbosa. Coordinates estimated from those of a nearby collection.

Collected by permit: Colorado School of Mines, 2020, issued: Apr 1, 2020, to: Tom Schweich.

Eremogone fendleri (A. Gray) Ikonnikov.  Fendler's Sandwort.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.6 mi. west on CO Hwy 72 from CO Hwy 93, 1.6 mi. generally north on Plainview Road, then 90 m. east along a terrace on the south side of an ephemeral stream, 19.8 km. north northwest of the GNIS location of Golden. 39.8894°N, 105.2609°W. WGS 1984 Elev. 1940 m. This site a little more dry and rocky than the surrounding area; also collected here or nearby: Tragopogon dubius, Penstemon secundiflorus and P. virens, Carex inops var. heliophila, and Koeleria macrantha.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Salix lasiandra Benth. var. caudata (Nutt.) Sudw.  Greenleaf Willow.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.6 mi. west on CO Hwy 72 from CO Hwy 93, 1.6 mi. generally north on Plainview Road, then 325 m. east along a terrace on the south side of an ephemeral stream, 19.9 km. north northwest of the GNIS location of Golden. 39.8896°N, 105.2588°W. WGS 1984 Elev. 1932 m. Beside ephemeral stream; in fruit. Also collected here or nearby: Galium boreale, Crataegus succulenta, Rosa arkansana, Toxicodendron rydbergii, and Gaillardia aristata.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Galium boreale S. Watson.  Bedstraw.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.6 mi. west on CO Hwy 72 from CO Hwy 93, 1.6 mi. generally north on Plainview Road, then 325 m. east along a terrace on the south side of an ephemeral stream, 19.9 km. north northwest of the GNIS location of Golden. 39.8896°N, 105.2588°W. WGS 1984 Elev. 1933 m. Along the south bank of ephemeral stream from this location extending generally east and downstream.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Plantago lanceolata L.  Narrowleaf Plantain.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.6 mi. west on CO Hwy 72 from CO Hwy 93, 1.6 mi. generally north on Plainview Road, then 325 m. east along a terrace on the south side of an ephemeral stream, 19.9 km. north northwest of the GNIS location of Golden. 39.8897°N, 105.2575°W. WGS 1984 Elev. 1927 m. Beside ephemeral stream.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Lithospermum multiflorum Torrey ex A. Gray.  Many Flowered Stoneseed.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 mi. west on CO Hwy 72 from CO Hwy 93, 1.2 mi. generally north on Plainview Road, then 500 m. east along a terrace on the north side of an ephemeral stream, 19.9 km. north northwest of the GNIS location of Golden. 39.8903°N, 105.2573°W. WGS 1984 Elev. 1931 m. Adjacent to a colony of Canada thistle.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Cirsium undulatum (Nutt.) Spreng.  Wavy Leaved Thistle.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 mi. west on CO Hwy 72 from CO Hwy 93, 1.2 mi. generally north on Plainview Road, then 450 m. east along the north side of an ephemeral stream, 19.9 km. north northwest of the GNIS location of Golden. 39.8905°N, 105.2579°W. WGS 1984 Elev. 1932 m. Scattered on a terrace above ephemeral stream.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Apocynum ×floribundum Greene.  Dogbane.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 mi. west on CO Hwy 72 from CO Hwy 93, 1.3 mi. generally north on Plainview Road, then 50 m. northeast on an old ranch road, 20.0 km. north northwest of the GNIS location of Golden. 39.8904°N, 105.2616°W. WGS 1984 Elev. 1949 m. Flowers light pink with darker pink stripes inside.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Asclepias stenophylla A. Gray.  Narrow-leaved Milkweed.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, southwestern corner of the park, west of Plainview Road, along the southern fence line, and continuing to the north to an ephemeral steam. 39.8843°N, 105.2663°W. WGS 1984 Foothills grassland.

Epilobium hirsutum L.  Hairy Willowherb.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 mi. west on CO Hwy 72 from CO Hwy 93, 0.9 mi. generally north on Plainview Road, then 300 m. west to a small wetland just above a reservoir, 19.4 km. north northwest of the GNIS location of Golden. 39.8865°N, 105.2647°W. WGS 1984 Elev. 1963 m. Loose gravelly soil, seasonally inundated. Colorado Noxious Weed List A.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Mirabilis linearis (Pursh) Heimerl.  Narrowleaf Four O'Clock.

Apex Park - Northern Parcel, Jefferson County, Colorado. About half way up the initial Rocky Mountain Front Range scarp, near the south edge of the restricted area, 5.1 km. south of the GNIS location of Golden. 39.7203°N, 105.2211°W. WGS 1984 Elev. 1997 m. On the edge of trail, usually single plants, widely dispersed, many inflorescences have been eaten.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Juniperus scopulorum Sarg.  Rocky Mountain Juniper.

Apex Park - Northern Parcel, Jefferson County, Colorado. About half way up the initial Rocky Mountain Front Range scarp, near the south edge of the restricted area, 5.03 km. south of the GNIS location of Golden. 39.7208°N, 105.222°W. WGS 1984 Elev. 2015 m. Large specimen, steep northeast-facing slope. Mostly foothills shrubland with a few junipers, also collected nearby: Mirabilis linearis, Ranunculus glaberrimus, Grindelia squarrosa, and Andropogon gerardii.

Collected by permit: Jefferson County Open Space, 2020, issued: Apr 13, 2020, to: Tom Schweich.

Polygonum douglasii Greene.  Douglas Knotweed.