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Montana Field Guide

Montana Field Guides

Tall Oatgrass - Arrhenatherum elatius

Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 0

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General Description
Cool season, perennial bunchgrass. Stems 40–120 cm, base of stem not enlarged or bulbous. Leaves: blades 5–9 mm wide, flat and lax; sheaths with overlapping margins; ligule membranous. Inflorescence a contracted panicle, 12–30 cm long, the branches short and verticillate. Spikelets 8–10 mm long, with 2 florets; glumes 1 nerved. Lemmas 8–9 mm long; staminate (first) floret with a twisted bent awn 1–1.6 cm long, occasionally lemma of fertile (second) floret short- to long-awned; palea well developed. Disarticulation above glumes; dispersal unit the floret cluster (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced throughout much of N. America (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Habitat
Mountain meadows, rangeland, pastures, and roadside ditches, and sometimes cultivated (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Tall Oatgrass — Arrhenatherum elatius.  Montana Field Guide.  .  Retrieved on , from