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Leymus
Family: Poaceae
Leymus image
Max Licher
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Mary E. Barkworth. Flora of North America
Plants perennial; sometimes cespitose, often rhizomatous. Culms 10-350 cm, erect, with extravaginal branching. Leaves basal or evenly distributed; sheaths open; auricles usually present; ligules membranous, truncate to rounded; blades often stiff, adaxial surfaces usually with subequal, closely spaced, prominently ribbed veins, sometimes with unequal, widely spaced, not prominently ribbed veins. Inflorescences usually distichous spikes with 1-8 spikelets per node, sometimes panicles with (2)3-35 spikelets associated with each rachis node; rachises with scabrous or ciliate edges; internodes 3.5-12(15) mm. Spikelets 1/2-3 3/4 times the length of the rachis internodes, usually sessile, sometimes pedicellate, pedicels to 5 mm, appressed to ascending, with 2-12 florets, the terminal floret usually reduced; disarticulation above the glumes, beneath the florets. Glumes usually 2, usually equal to subequal, the lower or both glumes sometimes reduced or absent, lanceolate and narrowing in the distal 1/4, or lanceolate to subulate and tapering from below midlength, pilose or glabrous, sometimes scabrous, 0-3(7)-veined, veins evident at least at midlength, sometimes keeled, keels straight or almost so, apices acute, acuminate, or tapering to an awnlike tip, if distinctly awned, awns to 4 mm; lemmas glabrous or with hairs, sometimes scabrous distally, inconspicuously 5-7-veined, rounded over the back proximally, sometimes keeled distally, keels not conspicuously scabrous distally, apices acute, unawned or awned, awns usually to 7 mm, sometimes 16-33 mm, straight; paleas slightly shorter than to slightly longer than the lemmas, keels usually scabrous or ciliate on the distal portion, sometimes throughout; lodicules 2, shortly hairy, lobed; anthers 3, 2.5-10 mm. Caryopses with hairy apices. x = 7. Haplomes Ns, Ns or Xm. Name an anagram of Elymus.
Vascular plants of NE US and adjacent Canada
Similar to Elymus, and like it with the rachilla twisted and the glumes displaced to stand side by side subtending the spikelets, but outcrossing, with anthers mostly over 3 mm, and with awnless or only shortly awned lemmas; plants tufted or more often on ±elongate rhizomes. 30, N. Hemisphere.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Species within checklist: Golden Spike National Historic Site
Leymus ajanensis
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Leymus akmolinensis
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not available
Leymus alaicus
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Leymus ambiguus
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Leymus angustus
Image of Leymus angustus
Leymus arenarius
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Leymus arenicola
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Leymus californicus
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Leymus chinensis
Image of Leymus chinensis
Leymus cinereus
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Leymus condensatus
Image of Leymus condensatus
Leymus crassiusculus
Image of Leymus crassiusculus
Leymus dasystachys
Image of Leymus dasystachys
Leymus divaricatus
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Leymus erianthus
Image of Leymus erianthus
Leymus flavescens
Image of Leymus flavescens
Leymus innovatus
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Leymus interior
Image of Leymus interior
Leymus karataviensis
Image of Leymus karataviensis
Leymus karelinii
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Leymus lanatus
Image of Leymus lanatus
Leymus mollis
Image of Leymus mollis
Leymus multicaulis
Image of Leymus multicaulis
Leymus paboanus
Image of Leymus paboanus
Leymus pacificus
Image of Leymus pacificus
Leymus racemosus
Image of Leymus racemosus
Leymus ramosus
Image of Leymus ramosus
Leymus salina
Image of Leymus salina
Leymus secalinus
Image of Leymus secalinus
Leymus sibiricus
Image of Leymus sibiricus
Leymus simplex
Image of Leymus simplex
Leymus tianschanicus
Image of Leymus tianschanicus
Leymus triticoides
Image of Leymus triticoides
Leymus velutinus
Image of Leymus velutinus
Leymus villosissimus
Image of Leymus villosissimus
Leymus x multiflorus
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Leymus x uclueletensis
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Leymus x vancouverensis
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Leymus × multiflorus
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The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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