Oxypolis rigidior (L.) Raf.
Common Name: COWBANE
Coefficient of Conservatism: 6
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

Moist woods, especially with tamarack (and poison sumac); marshes, fens, and wet (rarely dry) prairies; swampy streamside thickets and shores.

The foliage and tuberous roots are reputed to be poisonous to cattle. Plants with entire leaflets are easily recognized. Those with toothed leaflets are sometimes confused with Sium suave, which is more finely and densely toothed and has a corrugated stem. The stem in Oxypolis is terete (but striate).


Allegan County
Barry County
Berrien County
Branch County
Calhoun County
Cass County
Hillsdale County
Ingham County
Ionia County
Jackson County
Kalamazoo County
Kent County
Lenawee County
Livingston County
Monroe County
Montcalm County
Oakland County
Ottawa County
St. Joseph County
Van Buren County
Washtenaw County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. May 16, 2022. https://michiganflora.net/species.aspx?id=133.