Montana Field Guide

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- Kingdom - - Plantae
  - Division - Flowering Plants - Anthophyta
    - Class - Monocots - Monocotyledoneae
      - Order - Grasses/Sedges - Cyperales
        
        Family - Grasses - Poaceae
        
        Species - Six Weeks Grama - Bouteloua barbata

Six Weeks Grama - Bouteloua barbata

Undetermined Origin

Global Rank: G5
State Rank: SU
C-value:

Agency Status
USFWS:
USFS:
BLM:

General Description

Annual bunchgrass. Stems 10–40 cm long. Leaves: blades 1–2 mm wide, often curled. Inflorescence of 4 to 7 secund lateral divergent spikes, each 1–2 cm long and with 25 to 45 spikelets. Spikelets 3–4 mm long. Lemmas hairy and with an awn to 2 mm long, disarticulating from the spikelet, rudimentary florets 1 or 2 (Lavin in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments

Collected in Gallatin and Carbon counties; throughout southwest North America (Lavin in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

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

Recency

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

Habitat

Open dry disturbed sites, probably ephemeral (Lavin in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Stewardship Responsibility

References

Literature Cited AboveLegend: View Online Publication
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
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Citation for data on this website:
Six Weeks Grama — Bouteloua barbata. Montana Field Guide. Montana Natural Heritage Program. Retrieved on May 16, 2026, from https://FieldGuide.mt.gov/speciesDetail.aspx?elcode=PMPOA10030