Elymus trachycaulus subsp. trachycaulus

Common names: Slender wheatgrass Élyme à chaumes rudes Agropyre à chaumes rudes
Synonyms: Agropyron trachycaulum var. novae-angliae Elymus trachycaulus subsp. teslinensis Elymus trachycaulus subsp. novae-angliae Elymus trachycaulus subsp. major Agropyron trachycaulum var. typicum Agropyron trachycaulum var. pilosiglume Agropyron trachycaulum var. majus Agropyron teslinense Agropyron tenerum Agropyron pauciflorum Agropyron caninum var. tenerum Agropyron caninum var. majus Agropyron caninum subsp. majus Agropyron caninum var. bornemannii
Treatment appears in FNA Volume 24. Treatment on page 322.

Culms 30-150 cm. Spikes (4)8-30 cm long, 0.5-0.8 cm wide, 2-sided; internodes 8-15 mm. Spikelets with 3-9 florets, the bases usually visible. Glumes 5-17 mm, at least 1 vein scabrous to near the base, sometimes all veins scabrous, unawned or with straight awns shorter than 2 mm; lemmas unawned or awned, awns to 5 mm, straight.

Discussion

Elymus trachycaulus subsp. trachycaulus grows throughout the habitat and range of the species, and exhibits considerably more variation than subsp. subsecundus. Two aspects of the variation that seem particularly worthy of further study are the glume venation and the spacing of spikelets in the spikes. Plants with glumes having 5-7 well-developed, narrowly spaced veins are restricted to lower elevations and the southern portion of the subspecies range; northern plants and plants at higher elevations generally have 3-5 weakly developed and widely spaced veins. The former glumes resemble those of E. glaucus, with which E. trachycaulus subsp. trachycaulus is often sympatric; the latter, those of E. violaceus (p. 324). Spikelet spacing also varies considerably. In at least some instances, plants with widely spaced spikelets appear to be associated with more shady habitats.

Selected References

None.

Lower Taxa

None.

Mary E. Barkworth +, Julian J.N. Campbell +  and Bjorn Salomon +
(Link) Gould +
Slender wheatgrass +, Élyme à chaumes rudes +  and Agropyre à chaumes rudes +
Conn. +, N.J. +, N.Y. +, Wash. +, Wis. +, Alta. +, B.C. +, Greenland +, Man. +, N.B. +, Nfld. and Labr. +, N.S. +, N.W.T. +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, W.Va. +, Wyo. +, N.H. +, N.Mex. +, Tex. +, N.C. +, N.Dak. +, Pa. +, Calif. +, Nev. +, Va. +, Colo. +, Alaska +, Nebr. +, S.Dak. +, Vt. +, Ill. +, Ind. +, Iowa +, Ariz. +, Idaho +, Maine +, Md. +, Mass. +, Ohio +, Utah +, Mo. +, Minn. +, Mich. +, R.I. +, Kans. +, Mont. +, Ky. +  and Oreg. +
Agropyron trachycaulum var. novae-angliae +, Elymus trachycaulus subsp. teslinensis +, Elymus trachycaulus subsp. novae-angliae +, Elymus trachycaulus subsp. major +, Agropyron trachycaulum var. typicum +, Agropyron trachycaulum var. pilosiglume +, Agropyron trachycaulum var. majus +, Agropyron teslinense +, Agropyron tenerum +, Agropyron pauciflorum +, Agropyron caninum var. tenerum +, Agropyron caninum var. majus +, Agropyron caninum subsp. majus +  and Agropyron caninum var. bornemannii +
Elymus trachycaulus subsp. trachycaulus +
Elymus trachycaulus +
subspecies +