Home » Poaceae » Poa
Poa compressa L.
Common Name: CANADA BLUEGRASS
Coefficient of Conservatism: *
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Ad P-Grass

Widespread in old fields, roadsides, disturbed ground, rocky or sandy forests and openings (oak, aspen, jack pine), usually in dry places but sometimes on shores and in moist forests. Introduced from Europe very early and first collected in 1838 in Washtenaw Co.

This species and P. pratensis are two of our commonest grasses. They are generally segregated from our other species of Poa by the presence of creeping rhizomes, the plants thus forming large colonies. While a useful field character, the rhizomes may not be evident on specimens merely picked or pulled hastily from the ground. Hence, the presence of rhizomes was not emphasized in the key. Poa compressa differs from P. pratensis in the flattened, less tufted culms, lemmas with obscure intermediate nerves and sparse or even absent web at the base, and a tendency toward a more slender panicle with fewer branches at each node. Elongated vegetative stems, with nodes and internodes are common in P. compressa, but in P. pratensis, vegetative shoots are short and the stem-like portion is composed of overlapping leaf sheaths.

Locations

Alcona County
Alger County
Allegan County
Alpena County
Arenac County
    Including Charity Island
Baraga County
Barry County
Bay County
Benzie County
Berrien County
Branch County
Calhoun County
Cass County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Clare County
Clinton County
Crawford County
Delta County
Eaton County
Emmet County
Genesee County
Gladwin County
Gogebic County
Grand Traverse County
Hillsdale County
Houghton County
Huron County
Ingham County
Ionia County
Iosco County
Iron County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Lapeer County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Lenawee County
Livingston County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Macomb County
Manistee County
Marquette County
Mason County
Mecosta County
Menominee County
Midland County
Missaukee County
Monroe County
Montmorency County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ogemaw County
Ontonagon County
Oscoda County
Ottawa County
Presque Isle County
Roscommon County
Saginaw County
Sanilac County
Schoolcraft County
Shiawassee County
St. Clair County
Tuscola County
Van Buren County
Washtenaw County
Wayne County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 16, 2017. http://michiganflora.net/species.aspx?id=2195.