Eastern Mojave Vegetation Coll. No. 2442, Arrhenatherum elatius  
 

 

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  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. 39.7321N, 105.2158W. 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: 2/28/2021 9:37:04 AM