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Montana Field Guide

Montana Field Guides

Awnless Wildrye - Elymus submuticus
Other Names:  Elymus curvatus, Elymus virginicus var. submuticus

Status Under Review
Native Species

Global Rank: G4G5
State Rank: SU

Agency Status
MNPS Threat Rank:
C-value: 6

External Links

General Description
Cespitose perennials; culms 60-110 cm tall, stiffly erect or sometimes geniculate at base. Leaf shaths glabrous, often reddish brown; auricles to 1 mm or absent; ligules less than 1 mm long, ciliolate; blades 5-15 mm wide, upper surface smooth to somewhat scabrous. Spikes 9-15 cm long, up to 1.3 cm wide, erect, exserted or the bases slightly inserted; spikelets 2 per node. Spikelets 10-15 mm long, appressed, often reddish brown at maturity; florets (2)3-4(5) (only the lowest functional). Glumes equal or subequal, 7-15 mm long, the basal 2-3 mm portion indurate (hardened), terete, 1.2-2.1 mm wide and without evident venation, the upper portion of glume bodies widening and becoming 3-5 veined and strongly bowed out; disarticulation below glumes and beneath florets. Lemmas 6-10 mm long, glabrous or scabrous (rarely hirsute), awns straight and mostly 1-4 mm (rarely 5-10 mm on lemmas of uppermost spikelets); paleas 6-10 mm, obtuse, often emarginate. Anthers 1.5-3 mmm long (adapted from: Barkworth et al., 2007, Flora of N. America, Vol. 24, who treat the species as E. curvatus).

Range Comments
Widespread across Canada and northern 2/3 of USA but only common in Great Plains east with any regularity to MN, WI and IL (less frequent farther east) (Barkworth et al., 2007, Flora of North America, Vol. 24).

Observations in Montana Natural Heritage Program Database
Number of Observations: 3

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Moist or damp soils of open forests, thickets, grasslands, ditches, and disturbed ground, especially in bottomlands (Barkeworth et al., 2007, Flora of N. America, Vol. 24).

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Citation for data on this website:
Awnless Wildrye — Elymus submuticus.  Montana Field Guide.  .  Retrieved on , from