Common names: Sierra wheatgrass
Endemic
Synonyms: Agropyron pringlei
Treatment appears in FNA Volume 24. Treatment on page 332.

Plants cespitose, not rhizomatous. Culms 20-50 cm, prostrate or decumbent and geniculate; nodes 1-2, exposed, glabrous. Leaves basally concentrated; sheaths glabrous; auricles usually present, to 1 mm on the lower leaves; ligules 0.2-0.5 mm, erose; blades 1-5 mm wide, flat, abaxial surfaces smooth, glabrous, adaxial surfaces prominently ridged over the veins, with scattered hairs, hairs to 0.2 mm, veins closely spaced. Spikes 5-15 cm long, 1.5-2.5 cm wide including the awns, 0.7-1.2 cm wide excluding the awns, flexuous, erect to nodding distally, with 1 spikelet at most nodes, occasionally some of the lower nodes with 2 spikelets; internodes 5-15 mm long, 0.2-0.5 mm wide, both surfaces glabrous, edges ciliate, not scabrous. Spikelets 15-20 mm, ascending to divergent, with 3-7 florets; rachillas glabrous; disarticulation above the glumes, beneath each floret. Glumes subequal, 6-9 mm long, 0.7-1 mm wide, lanceolate, glabrous, the bases evidently veined, apices entire, tapering into a 3-10 mm awn; lemmas 12-16 mm, glabrous, sometimes scabridulous, apices bidentate, awned, awns 15-30 mm, arcuately diverging to strongly recurved; paleas subequal to the lemmas, apices about 0.4 mm wide; anthers 2-3.5 mm. 2n = 28.

Discussion

Elymus sierrae is best known from rocky slopes and ridgetops in the Sierra Nevada, at 2100-3400 m, and is also found in Washington and Oregon. It resembles E. scribneri (see previous), differing in its non-disarticulating rachises, longer rachis internodes, and longer anthers. Hybrids with E. elymoides (p. 318) have glumes with awns 15+ mm long, and some spikelets with narrower glume bases and shorter anthers. Specimens with wide-margined glumes suggest hybridization with E. violaceus (p. 324).

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Elymus sierrae"
membranous +  and scarious +
with hairs +  and scabrous +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
awned +  and entire +
bidentate +  and tapering +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Mary E. Barkworth +, Julian J.N. Campbell +  and Bjorn Salomon +
1 (?) +  and 3 (?) +
straight +
arcuately diverging +  and strongly recurved +
basal +  and apical +
from the sinus +  and terminal +
not geniculate +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
keeled +  and rounded +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
not evident +
cross +, linear +  and narrowly lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
spikelike +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
hairy +  and glabrous +
Sierra wheatgrass +
not branching +
decumbent +  and prostrate +
usually erect +  and ascending +
geniculate +
20 cm200 mm <br />0.2 m <br /> (50 cm500 mm <br />0.5 m <br />) +
not woody +
Idaho +, Mont. +, Nebr. +, N.C. +, Conn. +, N.J. +, N.Y. +, Mass. +, Wash. +, Va. +, W.Va. +, Ark. +, Iowa +, Kans. +, Mo. +, N.Dak. +, Okla. +, S.Dak. +, Ariz. +, D.C +, Ga. +, Ill. +, Ky. +, Mich. +, N.Mex. +, Pa. +, S.C. +, Tenn. +, Wyo. +, Del. +, Miss. +, Ind. +, Oreg. +, Maine +, N.H. +, R.I. +, Vt. +, Ala. +, Fla. +, La. +, Md. +, N.S. +, Ohio +, Tex. +, Wis. +, Colo. +, Calif. +, Alaska +, Utah +, Nev. +, Alta. +, B.C. +, Greenland +, Man. +, N.B. +, Nfld. and Labr. +, N.W.T. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +  and Minn. +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
3 +  and 7 +
laterally compressed +  and terete +
(0)1-7-veined +
shorter than to longer than the adjacent florets +
6mm +  and 9mm +
subtending +
lanceolate +
subequal +
0.7mm +  and 1mm +
uncinate +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
solid +  and hollow +
1.5 cm15 mm <br />0.015 m <br /> (?) +
5mm +  and 15mm +
0.2 cm2 mm <br />0.002 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (?) +  and 0.05 cm0.5 mm <br />5.0e-4 m <br /> (?) +
ciliate +  and scabrous +
distributed +
scabridulous +
linear-lanceolate +
1.2 cm12 mm <br />0.012 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
stiffly membranous +  and coriaceous +
erose +  and entire +
acute +, rounded +  and truncate +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
membranous +
inconspicuous +
lanceolate +
fleshy +  and membranous +
1 +  and 2 +
2 +  and 1 +
hairy +  and glabrous +
well-developed +
slightly longer +
subequal +
dry +  and fleshy +
spikelike +
5 cm50 mm <br />0.05 m <br /> (?) +  and 15 cm150 mm <br />0.15 m <br /> (?) +
subsessile +  and sessile +
bisexual +  and sterile +
terete +  and compressed +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1 +  and 3 +
simple +  and compound +
2 (?) +  and 3 (?) +
not papillate +
Agropyron pringlei +
Elymus sierrae +
species +
membranous +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
inconspicuous +
unequal +
plant +  and cespitose +
aquatic +  and terrestrial +