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Montana Field Guides

Purple Three-awn Grass - Aristida purpurea
Other Names:  Aristida longiseta

Native Species

Global Rank: G5
State Rank: S4S5

Agency Status
USFWS:
USFS:
BLM:
NS THREAT SCORE:
C-value: 3


 

External Links






 
General Description
Warm season, perennial bunchgrass. Stems 15–40 cm. Leaves: blades curly to straight, 1–2 mm wide; ligules hairy, 0.3–0.5 mm long; sheaths with overlapping margins. Inflorescence a contracted panicle 6–25 mm long. Spikelets 10–18 mm long excluding awns, with one floret; first glume 1/2 the length of the second. Lemma 9–15 mm long (including awn column), gradually tapering into a tripartite awn, awn segments 2–5 cm long; palea enclosed in floret. Disarticulation above the glumes; dispersal unit the floret (Lavin in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range

Year-round
 


Range Comments
Throughout much of western two-thirds of 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: 542

(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 often shrub-steppe settings and on various soils (Lavin in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

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
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    • Anderson, N.L. 1951. Field studies on the biology of range grasshoppers of southeastern Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University. 96 p.
    • 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.
    • Durham, R. A., D. L. Mummey, L. Shreading, and P.W. Ramsey. 2017. Phenological patterns differ between exotic and native plants: Field observations from the Sapphire Mountains, Montana. Natural Areas Journal, 37(3), 361–381.
    • Fritzen, D.E. 1995. Ecology and behavior of Mule Deer on the Rosebud Coal Mine, Montana. Ph.D. Dissertation. Bozeman, MT: Montana State University. 143 p.
    • Haile, K.F. 2011. Fuel load and heat effects on Northern mixed prairie and four prominent rangeland graminoids. M.Sc. Thesis. Bozeman, MT: Montana State University. 71 p.
    • Harvey, S.J. 1990. Responses of steppe plants to gradients of water soil texture and disturbance in Montana, U.S.A. Ph.D. Thesis. Bozeman, MT: Montana State University. 34 p.
    • Johnson, J.D. 2004. Restoring native species to crested wheatgrass dominated rangelands. M.Sc.Thesis. Bozeman, MT: Montana State University. 58 p.
    • King, L.A. 1980. Effects of topsoiling and other reclamation practices on nonseeded species establishment on surface mined land at Colstrip, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 129 p.
    • Kitchen, K.A. 2010. The influence of Douglas-fir and Rocky Mountain juniper on Wyoming and mountain big sagebrush cover in southwest Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 87 p.
    • Mathews, S.L. 1995. Evolution of the phytochrome gene family in land plants and its utility for phylogenetic analyses of flowering plants. Ph.D. Dissertation. Bozeman, MT: Montana State University. 85 p.
    • Meier, G.A. 1997. The colonization of Montana roadsides by native and exotic plants. M.Sc. Thesis. Bozeman, MT: Montana State University. 45 p.
    • Morris, M.S. and J.E. Schwartz. 1957. Mule deer and elk food habits on the National Bison Range. Journal of Wildlife Management 21(2):189-193.
    • Mussgnug, G.L. 1972. The structure and performance of an adult population of Aulocara elliotti (Thomas) (Orthoptera, Acrididae) near Billings, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 97 p.
    • Nielsen, L.S. 1978. The effects of rest-rotation grazing on the distribution of Sharp-tailed Grouse. M.Sc. Thesis. Bozeman, MT: Montana State University. 52 p.
    • Quire, R.L. 2013. The sagebrush steppe of Montana and southeastern Idaho shows evidence of high native plant diversity, stability, and resistance to the detrimental effects of nonnative plant species. M.Sc. Thesis. Bozeman, MT: Montana State University. 124 p.
    • Rennick, R.B. 1981. Effects of prescribed burning on mixed prairie vegetation in southeastern Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 144 p.
    • Rinella, M.J., A.D. Knudsen, J.S. Jacobs, and J.M. Mangold. 2020. Seeding causes long-term increases in grass forage production in invaded rangelands. Rangeland and Ecology Management 73(2020): 329-333.
    • Rundquist, V.M. 1973. Avian ecology on stock ponds in two vegetational types in north-central Montana. Ph.D. Dissertation. Bozeman, MT: Montana State University. 112 p.
    • Scow, K.L. 1981. Ecological distribution of small mammals at Sarpy Creek, Montana, with special consideration of the Deer Mouse, Peromyscus maniculatus. M.Sc. Thesis. Bozeman, Montana: Montana State University. 73 p.
    • Skilbred, Chester L. 1979. Plant succession on five naturally revegetated strip-mined deposits at Colstrip, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 128 pp.
    • Skinner, K.F. 1995. Plant and grasshopper community composition: indicators & interactions across three spatial scales. M.Sc. Thesis. Bozeman, MT: Montana State University. 144 p.
    • Thompson, W. L. 1993. Ecology of Merriam's Turkeys in relation to burned and logged areas in southeastern Montana. Ph.D. Dissertation. Bozeman, MT: Montana State University. 195 p.
    • Williams, A.R. 2020. Evaluating grazing and defoliation effects on ponderosa pine grassland following the Lodgepole Complex wildfire. M.Sc. Thesis. Bozeman, MT: Montana State University. 70 p.
    • Wiman, N.G. 2001. Dynamics of leafy spurge (Euphorbia esula L.) infested plant communities influenced by flea beetles in the Aphthona complex (Colepotera: Chrysomelidae). M.Sc. Thesis. Bozeman, MT: Montana State University. 148 p.
    • Wood, A.K. 1987. Ecology of a prairie mule deer population. Ph.D. Dissertation. Bozeman, MT: Montana State University. 205 p.
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Citation for data on this website:
Purple Three-awn Grass — Aristida purpurea.  Montana Field Guide.  .  Retrieved on , from