Eastern Mojave Vegetation Coll. No. 2442, Arrhenatherum elatius  
 

 

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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 Arrhenatherum elatius
Photographed 31 December 2020,

Native and Naturalized Flora of the Golden Area, Jefferson County, Colorado
Poaceae

Arrhenatherum elatius (L.) P. Beauv. ex J. Presl & C. Presl.  Tall Oatgrass.

Deadman Gulch, Jefferson County, Colorado. On the edge of the streambed in Deadman Gulch (Kinney Run), above US Highway 6 and just below Eagle Ridge Drive, 3.43 km. south of the GNIS location of Golden. 39.7321°N, 105.2158°W. WGS 1984 Elev. 1803 m. Riparian, also seen or collected nearby: Clematis ligusticifolia, Mirabilis nyctaginea, Crataegus succulenta, Epilobium hirsutum, and Symphyotrichum lanceolatum var. hesperium.

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

Tom Schweich 2442. 28-Aug-2020

Coll. No. 2442, 28 August 2020, characters observed: Perennial, to 115 cm., tufted, no rhizomes observed; Leaves, sheath, 100 mm., open, ligule, 2.5 mm., membranous, erose, blade, 30 mm. × 5 mm. wide, flat, barely scabrous; Inflorescence, 1 per culm, >leaves, panicle, 200 mm. × 40 mm. wide; Rachis, not extended, delicate; Spikelets, many, 8 mm. × 2.3 mm. wide + awn, similar, borne singly; Disarticulation, above the glumes; Glumes, very thin, translucent, lower, 5 mm., veins, #1, tip bifid, upper, 9 mm., =lowest floret, veins, #3, ±parallel, awns, absent; Florets, 2 per spikelet; Callus, straight hairs, 2.3 mm.; Lemma, 8 mm., =glumes, veins, #7, awn, #1, 14 mm., twisted, round, attached near base (2.3/8.0); Palea, 6 mm., membranous, margin, ciliate.

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Date and time this page was prepared: 11/3/2024 5:39:55 PM