Difference between revisions of "Leymus flavescens"
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|synonyms={{Treatment/ID/Synonym | |synonyms={{Treatment/ID/Synonym | ||
|name=Elymus flavescens | |name=Elymus flavescens | ||
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| + | |rank=species | ||
}} {{Treatment/ID/Synonym | }} {{Treatment/ID/Synonym | ||
|name=Elymus arenicolus | |name=Elymus arenicolus | ||
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}} | }} | ||
|hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Triticeae;Leymus;Leymus flavescens | |hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Triticeae;Leymus;Leymus flavescens | ||
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name=Leymus flavescens | name=Leymus flavescens | ||
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|authority=(Scribn. & J.G. Sm.) Pilg. | |authority=(Scribn. & J.G. Sm.) Pilg. | ||
|rank=species | |rank=species | ||
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|basionyms= | |basionyms= | ||
|family=Poaceae | |family=Poaceae | ||
| + | |illustrator=Cindy Roché | ||
| + | |illustration copyright=Utah State University | ||
|distribution=Alta.;Wash.;Utah;Oreg.;Mont.;Idaho | |distribution=Alta.;Wash.;Utah;Oreg.;Mont.;Idaho | ||
|reference=None | |reference=None | ||
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|subfamily=Poaceae subfam. Pooideae | |subfamily=Poaceae subfam. Pooideae | ||
|tribe=Poaceae tribe Triticeae | |tribe=Poaceae tribe Triticeae | ||
Latest revision as of 17:24, 11 May 2021
Plants sometimes cespitose, strongly rhizomatous. Culms 40-120 cm tall, 2-4 mm thick, pubescent beneath the nodes. Leaves exceeded by the spikes; sheaths glabrous; auricles absent, sometimes with a few hairs in the auricular position; ligules 0.3-1.5 mm; blades 3-4 mm wide, usually involute, adaxial surfaces scabrous, sometimes with scattered hairs, hairs to 1 mm, with about 15 closely spaced, subequal, mostly prominently ribbed veins. Spikes 10-20 cm long, 12-20 mm thick, with 12-20 nodes and 2 spikelets per node; internodes 7-10 mm, densely hairy. Spikelets 13.5-25 mm, with 4-9 florets. Glumes 8.5-16 mm long, 0.5-2.5 mm wide, stiff, keeled distally, the central portion thicker than the margins, tapering from below midlength to the subulate apices, hairy, 0-1(3)-veined, veins inconspicuous at midlength; lower glumes 8.5-13.5 mm; upper glumes 10-16 mm; calluses poorly developed; lemmas 10.5-15 mm, densely villous, hairs 2-3 mm, apices unawned or awned. awns to 2 mm; anthers 4.5-7 mm, dehiscent. 2n = 28.
Distribution
Alta., Wash., Utah, Oreg., Mont., Idaho
Discussion
Leymus flavescens grows on sand dunes and open sandy flats, and ditch- and roadbanks, of the Snake and Columbia river valleys. The central Washington population is growing on a road cut; it seems to be well established there.
Plants identified as Elytnus arenicolus Scribn. & J.G. Sm. are included here, but they may represent hybrids between Leymus flavescens and L. triticoides. Leckenby, the collector of the type specimen, noted that they grew on sand or sand drifts along the Columbia River, but could not withstand flooding. He could find no seed.
Selected References
None.