Page author: Don Knoke
Aristida purpurea

Distribution: British Columbia and eastern Washington, east to the Dakotas, south to Oregon and Arizona.

Habitat: Desert plains and grasslands, into the foothills.

Flowers: June - July

Origin: Native

Conservation Status: Not of concern


Strongly tufted perennial, the stems 2-4 dm. tall.


Leaf blades involute, 1-2 mm. broad, 7-25 cm. long; ligules 0.5 mm long, the frontal margin with hairs 2-3 mm. long.


Inflorescence a narrow panicle 5-10 cm. long, the branches loosely ascending; glumes awn-tipped, the first 7-13 mm. long, the second nearly twice as long; floret 10-15 mm. long, the callus flattened, 1 mm. long; lemma convolute, with a trifid, terminal awn 5-8 cm. long, the lateral branches divergent; palea 2-2.5 mm. long, mush shorter than the lemma.



Accepted Name:
Aristida purpurea Nutt.

Synonyms & Misapplications:
(none provided)
var. longiseta – red threeawn
Additional Resources:

PNW Herbaria: Specimen records of Aristida purpurea in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Aristida purpurea checklist entry.

E-Flora BC: Aristida purpurea atlas page.

CalPhotos: Aristida purpurea photos.

USDA Plants: Aristida purpurea information.

24 photographs:
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