Calamovilfa longifolia (Hook.) Scrib.
Coefficient of Conservatism: 10
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt P-Grass

An important sand-binder of the dunes and beaches of the Great Lakes; rarely spreading along sandy roadsides and railroads, in jack pines and sand barrens, mostly near the shores. Not quite so confined to the Great Lakes shores as Ammophila or Elymus lanceolatus, but ocurring rarely somewhat inland in sand barrens, as in Newaygo Co.

Michigan specimens are almost all the Great Lakes region endemic var. magna Scribn. & Merr. This has an open, spreading panicle, compared to var. longifolia, which ranges west of Michigan and has a narrowly contracted panicle. Variety longifolia is apparently adventive along railroads in Kalamazoo Co. Calamovilfa longifolia var. magna is readily distinguished from Ammophila, our other common sand-binding dune grass, by the smaller spikelets in a more open panicle and, vegetatively, by the usually villous lower sheaths and often greater height (sometimes over 2 m).

Sometimes casually mistaken for Panicum virgatum (and vice-versa), which may also grow on the dunes, but easily distinguished by the tuft of hairs at the base of the lemma, which is lacking in the Panicum.


Alcona County
Allegan County
Alpena County
Antrim County
Arenac County
Benzie County
Berrien County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
Emmet County
Grand Traverse County
Houghton County
Huron County
Iosco County
Kalamazoo County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Manistee County
Marquette County
Mason County
Muskegon County
Newaygo County
Oceana County
Ottawa County
Presque Isle County
Schoolcraft County
St. Clair County
Van Buren County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. August 19, 2022.