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Montana Field Guide

Montana Field Guides

Thurber's Needlegrass - Stipa thurberiana
Other Names:  Achnatherum thurberianum

Status Under Review
Native Species

Global Rank: G5
State Rank: SU

Agency Status
MNPS Threat Rank:

External Links

General Description
Stems 40–70 cm. Leaves: blades 1–2 mm wide, essentially hairless at the throat; ligule 3–6 mm long. Inflorescence a contracted panicle 5–16 cm long. Spikelets 10–15 mm long. Lemmas with appressed hairs, awn 3–5 cm with plumose hairs on the lower portion (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Specimen coll. 7/28/43, presumably in flower.

Diagnostic Characteristics
Distinguished from Stipa comata by glumes less than 15 mm long, and conspicuously hairy on lower part of awn. Distinguished from other hairy species of Stipa
by hairs on the awn that are 1 mm long or longer.

Observations in Montana Natural Heritage Program Database
Number of Observations: 2

(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)


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Citation for data on this website:
Thurber's Needlegrass — Stipa thurberiana.  Montana Field Guide.  .  Retrieved on , from