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Canada Bluegrass - Poa compressa
Other Names:
Flattened Meadow-grass
General Description
Rhizomatous perennial. Stems 20–50 dm, wiry and flattened, nodes often distinctly bent and banded with contrasting lighter and darker bands. Leaves: blades 1.5–4 mm wide, from stem, rarely basal; ligules 1–3 mm long. Inflorescence a narrow panicle 2–8 cm long. Spikelets 3–6 mm long. Lemmas with cobwebby hairs at very base (Lavin in
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Diagnostic Characteristics
The genus Poa is distinguished by its flat leaf blades, 2-6 flowered panicles, 1-3 nerved glumes, and 5-nerved lemmas (Gleason 1957, Mohlenbrock 1972, Hitchcock 1950). Some species have a tuft of cobwebby hairs at the base.
Poa compressa is visually separated from Poa pratensis by its blue-green foliage, distinctly flat culms and narrow compact inflorescence (Gleason and Cronquist 1953, USDA 1948). Bases of the strongly keeled lemmas are less conspicuously cobwebby than on Poa pratensis (Gleason and Cronquist 1953).
Species Range
Montana Range
Range Descriptions
Non-native
Range Comments
Despite its common name, Canada bluegrass (Poa compressa) is undisputedly considered to be a European introduction (Hitchcock 1950, USDA 1948, Fernald 1950, Gleason and Cronquist 1953).
Introduced throughout most 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: 677
(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
Roadside, road cuts, trailside, along ditches, and on open slopes and other open site with a combination of moisture and regular moderate disturbance (Lavin in
Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Management
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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Ament, R.J. 1995. Pioneer Plant Communities Five Years After the 1988 Yellowstone Fires. M.Sc. Thesis. Bozeman, MT: Montana State University. 216 p.- Brey, C.W. 1998. Epidemiology of wheat curl mite (Aceria tosichella K.) and wheat streak mosaic virus on feral grass species and effect of glyphosate on wheat curl mite dispersal. Ph.D. Dissertation. Bozeman, MT: Montana State University. 136 p.
- Carroll, M.W. 1998. Influence of a legume covercrop on volunteer wheat, the wheat curl mite, Aceria tosichella (K.) and wheat streak mosaic virus. M.Sc. Thesis. Bozeman, MT: Montana State University. 78 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.
- Culver, D.R. 1994. Floristic analysis of the Centennial Region, Montana. M.Sc. Thesis. Montana State University, Bozeman. 199 pp.
- Eggers, M.J.S. 2005. Riparian vegetation of the Montana Yellowstone and cattle grazing impacts thereon. M.Sc. Thesis. Montana State University, Bozeman, MT. 125 p.
- Fogelsong, M.L. 1974. Effects of fluorides on Peromyscus maniculatus in Glacier National Park. M.Sc. Thesis. Bozeman, Montana: Montana State University. 52 p.
- Gaffney, W.S. 1941. The effects of winter elk browsing, South Fork of the Flathead River, Montana. Journal of Wildlife Management 5(4):427-453.
- Guenther, G.E. 1989. Ecological relationships of bitterbrush communities on the Mount Haggin Wildlife Management Area. M.Sc. Thesis. Bozeman, MT: Montana State University. 73 p.
- Husby, P.O. 1982. Effects of grazing on vegetation in the Artemisia tridentata-Festuca idahoensis habitat type. M.Sc. Thesis. Bozeman, MT: Montana State University. 76 p.
- Jorgensen, H.E. 1970. Ecological aspects of the life history of Agropyron smithii Rydb. in Central Montana, with related effects of selective herbicide treatments of rangeland. Ph.D. Dissertation. Bozeman, MT: Montana State University. 118 p.
- Law, D.J. 1999. A comparison of water table dynamics and soil texture under black cottonwood recent alluvial bar, beaked sedge, and Geyer's/Drummond's willow communities. M.Sc. Thesis. Bozeman, MT: Montana State University. 68 p.
- 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.
- Martinka, R.R. 1970. Structural characteristics and ecological relationships of male blue grouse (Dendragapus obscurus (Say)) territories in southwestern Montana. Ph.D Dissertation. Bozeman, MT: Montana State University. 73 p.
- Maxwell, B.D. 1984. Changes in an infested plant community after an application of picloram, the effect of glyphosate on bud dormancy, the effect of pulling and the fuel potential of leafy spurge (Euphorbia esula L.). M.Sc. Thesis. Bozeman, MT: Montana State University. 73 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.
- Parks, J.C. 1986. Plant materials for use on disturbed alpine areas in Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 57 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.
- Seipel, T.F. 2006. Plant species diversity in the sagebrush steppe of Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 87 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.
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