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Montana Field Guide

Montana Field Guides

Dense Silky Bentgrass - Apera interrupta
Other Names:  Italian Sandgrass, Agrostis interrupta

Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 1

External Links






 
General Description
Cool season, annual bunchgrass. Stems few-bunched, 15–40 cm. Leaves: blades 0.5–1 mm wide, flat and ascending; sheaths with overlapping margins; ligule membranous. Inflorescence a contracted panicle 2–8 cm long. Spikelets with one floret 1.7–2 mm long; glume with a scabrous midvein. Lemmas 1.5–1.9 mm long, awned from the upper two-thirds with a slender awn 5–9 mm long; palea about as long as the lemma (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range

Non-native
 


Range Comments
Sporadic but introduced throughout North America except in the central tier of provinces and states and in the southeast (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 14

(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
Disturbed moist settings including depressions where water collects and lake margins at moderate elevations (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Management

References
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Cope, M.G. 1992. Distribution, habitat selection and survival of transplanted Columbian Sharp-tailed Grouse (Tympanuchus phasianellus columbianus) in the Tobacco Valley, Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University. 60 p.
    • Johnson, T. W. 1982. An analysis of pack and saddle stock grazing areas in the Bob Marshall Wilderness. M.Sc.Thesis. Bozeman, MT: Montana State University. 105 p.
    • 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:
Dense Silky Bentgrass — Apera interrupta.  Montana Field Guide.  .  Retrieved on , from