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Montana Field Guide

Montana Field Guides

Purple Three-awn Grass - Aristida purpurea
Other Names:  Aristida longiseta


Global Rank: G5
State Rank: S4S5

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 3

External Links






 
General Description
Warm season, perennial bunchgrass. Stems 15–40 cm. Leaves: blades curly to straight, 1–2 mm wide; ligules hairy, 0.3–0.5 mm long; sheaths with overlapping margins. Inflorescence a contracted panicle 6–25 mm long. Spikelets 10–18 mm long excluding awns, with one floret; first glume 1/2 the length of the second. Lemma 9–15 mm long (including awn column), gradually tapering into a tripartite awn, awn segments 2–5 cm long; palea enclosed in floret. Disarticulation above the glumes; dispersal unit the floret (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
Throughout much of western two-thirds of N. America (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 36

(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
Open dry often shrub-steppe settings and on various soils (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:
Purple Three-awn Grass — Aristida purpurea.  Montana Field Guide.  .  Retrieved on , from