Leymus triticoides
Leymus ambiguus
beardless lyme grass, beardless wildrye, creeping wildrye
Colorado wildrye
45-125 cm tall, 1.8-3 mm thick, solitary or few together.
60-110 cm tall, 1-1.5 mm thick, many together.
exceeded by the spikes, often basally concentrated;
sheaths glabrous or hairy, hairs 0.5-1 mm;
auricles to 1 mm;
ligules 0.2-1.3 mm, truncate, erose;
blades 10-35 cm long, 3.5-10 mm wide, flat to involute, usually stiffly ascending, adaxial surfaces usually scabrous, often also sparsely hairy, hairs to 0.8 mm, most abundant proximally, veins 11-27, closely spaced, subequal, prominently ribbed.
exceeded by the spikes;
sheaths glabrous or sparsely pubescent;
auricles to 1.1 mm;
ligules 0.2-1.2 mm, truncate;
blades 2.5-6 mm wide, flat, adaxial surfaces scabridulous, glabrous, veins (9)11-17, unequal, not crowded.
5-20 cm long, 5-15 mm wide, with 2 spikelets at midspike, sometimes 1 or 3 at other nodes;
internodes 5-11.5 mm, usually mostly smooth and glabrous, sometimes strigillose distally, edges ciliate, cilia to 0.4 mm.
8-17 cm long, 5-10 mm wide, erect, with 2 spikelets at most nodes;
internodes 4-11 mm, surfaces hairy distally, hairs 0.2-0.8 mm, edges ciliate.
10-22 mm, with 3-7 florets.
12-23 mm, with 2-7 florets.
5-16 mm long, 0.5-1.2 mm wide, bases not overlapping, glabrous and smooth proximally, scabrous distally, tapering from below midlength to the subulate apices, stiff, keeled, the central portion thicker than the margins, 1(3)-veined, veins inconspicuous at midlength;
calluses usually glabrous, occasionally with a few hairs, hairs about 0.1 mm;
lemmas 5-12 mm, usually glabrous, occasionally sparsely hairy, hairs to 0.3 mm, apices acute, usually awned, awns to 3 mm;
anthers 3-6 mm, dehiscent.
unequal, 0.5-2.5 mm wide, tapering from below midlength to the subulate apices, stiff, keeled, the central portion thicker than the margins, glabrous, scabrous, particularly distally, bases not overlapping, 0-1(3)-veined, veins inconspicuous at midlength;
lower glumes 2-9.5 mm;
upper glumes 6-14 mm;
calluses with hairs, hairs about 0.2 mm;
lemmas 8-14.5 mm, glabrous or sparsely strigose, awned, awns 1.3-7 mm;
anthers 3.5-7 mm, dehiscent.
= 28.
= 28.
Leymus triticoides
Leymus ambiguus
Leymus triticoides grows in dry to moist, often saline meadows. Its range extends from southern British Columbia to Montana, south to California, Arizona, and New Mexico, but its populations are widely scattered. It is not known from Mexico. There is considerable variation within the species, but no pattern of variation suggesting the existence of infraspecific taxa is known. It is very similar to L. multicaulis, strains of which were initially released as L. triticoides by the U.S. Department of Agriculture. The most consistent differences between them appear to be in the venation of the leaf blades and the vestiture of the calluses. Leymus triticoides is also very similar to L. simplex, differing from it in the number of spikelets at the midspike nodes.
Leymus triticoides hybridizes with other species of Leymus; hybrids with L. mollis are called L. xvancouverensis (see p. 358), those with L. condensatus are called L. xmultiflorus (see p. 362). Hybrids with L. cinereus are known, but have not been formally named. Plants identified as Elymus arenicolus Scribn. & J.G. Sm. are here included in L. flavescens, but may represent hybrids between L. triticoides and L. flavescens.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Leymus ambiguus grows on steep, often boulder-strewn hillsides at scattered locations in Colorado and New Mexico.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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