Annual Muhly - Muhlenbergia minutissima
State Rank Reason (see State Rank above)
Muhlenbergia minutissima is known from 7 locations observed from 1895 to 2015 in central and western Montana. It is also reported to occur in northeast Montana, but specimens have not been located (Peterson in FNA 2003). A 1941 occurrence near Belgrade has been searched for in recent decades, but not re-located (Matt Lavin personal communication). Plants can occupy disturbed areas, yet populations may not be persisting. Surveys that bring forth current data on locations, populations sizes, habitat requirements, or threats is needed.
- Details on Status Ranking and Review
ScoreE - 5,000-20,000 sq km (~2,000-8,000 sq mi)
Comment14,797 square kilometers
Area of Occupancy
ScoreD - 6-25 4-km2 grid cells
CommentPlant occurs in 7 of the 30,590 4x4 square-kilometer grid cells that cover Montana.
Number of Populations
ScoreB - 6 - 20
ScoreC - Moderate. Generalist or community with some key requirements scarce
ScoreD - Low
Annual bunchgrass. Stems 5–39 cm. Leaves: blades 1–2 mm wide; ligule about 1 mm long. Inflorescence an open panicle 5–15 cm long. Spikelets 1–1.5 mm long. Lemmas unawned to awn-tipped, callus hairs few to absent (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Collected July and August.
This is our only annual Muhlenbergia with an open, spreading inflorescence. It could be confused with species of Panicum and Agrostis. A technical key and a hand lens or microscope are needed for positive determination.
Collected in Gallatin County; sporadic throughout western U.S. (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
Moist soil along rivers and streams in the valleys.
- Additional ReferencesLegend: View Online Publication
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- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.