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Montana Field Guide

Montana Field Guides

Littleseed Ricegrass - Oryzopsis micrantha
Other Names:  Piptatherum micranthum

Status Under Review
Native Species

Global Rank: G5
State Rank: SU

Agency Status
MNPS Threat Rank:

External Links

General Description
Stems 30–80 cm. Leaves: blades 1–2.5 mm wide, smooth, ligules 1–2 mm long. Inflorescence a narrow to open panicle 5–20 cm long. Spikelets 3–3.5 mm long. Lemmas hairless to sparsely hairy, with a deciduous straight awn 5–8 mm long (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
Throughout much of western and central U.S. and southwestern Canada (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 48

(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)


  • Additional ReferencesLegend:   View Online Publication
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    • Idaho Native Plant Society. 1993. Federal candidate (C1 and C2) and listed rare plants of Idaho. unpaginated.
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Littleseed Ricegrass — Oryzopsis micrantha.  Montana Field Guide.  .  Retrieved on , from