Eastern Mojave Vegetation Coll. No. 3309, Elymus trachycaulus ssp. trachycaulus  
 

 

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If you have a question or a comment about this photograph you may write to me at: tomas@schweich.com I sometimes post interesting questions in my FAQ, but I never disclose your full name or address. 		  Poaceae Elymus trachycaulus trachycaulus
Photographed 15 December 2024.

Plants of the Coal Creek Canyon Study Area
Jefferson County Open Space, Colorado, USA
Poaceae

Elymus trachycaulus (Link) Gould ex Shinners ssp. trachycaulus.  Slender Wheatgrass.

Coal Creek Canyon Study Area, Lacey Parcel, Jefferson County, Colorado. Upper end of a northeast-facing meadow, on gentle southeast-facing slope, 345 m. south of Coal Creek, 1.52 km. west of Coal Creek Canyon Fire Station #3, 14.8 km. north northwest of Golden. 39.87577°N, 105.29513°W. WGS 1984 Elev. 2130 m. Somewhat glaucous, only a couple in bloom. Top end of meadow below canyon slope, with: Geranium caespitosum, Prunus virginiana, Allium cernuum, and Nassella viridula.

Collected by permit: Jefferson County Open Space, 2024, issued: Mar 6, 2024, to: Tom Schweich.

Tom Schweich 3309. 19-Jul-2024

Coll. No. 3309, 19 July 2024, characters observed: Perennial grass, to 80 cm., clumped, rhizomes not seen; Leaves, sheath, 82 mm., open, ligule, membranous, 0.7 mm., blade, 150 mm. × 6.5 mm. wide, flat; Inflorescence, 1 per culm, >leaves, two-sided spike, 110 mm. × 9 mm. wide; Rachis, not extended, scabrous; Spikelets, many, flat side to rachis, 16.5 mm. × 2.6 mm. wide, similar, borne singly, sessile, overlap 6 mm. = 36%; Disarticulation, above the glumes, between florets; Glumes, lower (smaller), 10 mm. × 2 mm. wide, veins, #5, upper (larger), 11 mm. × 2.3 mm. wide, <lowest floret, veins, #5, rounded, tough, awns, #1, 1.0-1.2 mm., margins, hyaline; Florets, 6 per spikelet, bisexual; Lemma, 11 mm., >glumes, rolled, veins, #5, glabrous, awns, #1, 2 mm., straight, difficult to tease away from lemma and achene; Palea, 8 mm., <lemma; Achene, 5 mm., tan, fused to lemma.

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Date and time this page was prepared: 1/5/2025 2:39:59 PM