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Montana Field Guide

Montana Field Guides

Spike-oat - Helictotrichon hookeri
Other Names:  Avenula hookeri


Global Rank: G5
State Rank: S4

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

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General Description
Cool season, perennial bunchgrass Stems 20–40 cm. Leaves: ascending, the larger blades (2-)3–4 mm wide, flat to folded along midrib; sheaths with overlapping margins; ligule membranous. Inflorescence a contracted panicle 2–11 cm long. Spikelets 11–15 mm long with mostly 3 to 6 florets; glumes nearly enclosing the florets. Lemmas 3–5 mm long, uniformly awned from the middle, the awns twisted and bent; palea well developed. Disarticulation above glumes; unit of dispersal the floret (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
NM north to northwestern Canada, east to QC (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 3

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

Recency

 

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



Habitat
Northern plains and middle to high elevation montane meadows and open understory (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:
Spike-oat — Helictotrichon hookeri.  Montana Field Guide.  .  Retrieved on , from