Acorus calamus L.
Coefficient of Conservatism: *
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Ad P-Forb

Acorus calamus Inflorescence B. S. Walters Inflorescence

Wet open places; pastures, ditches, and shores of lakes and streams. First collected in Oakland Co. in 1913.

The introduced European species is a sterile triploid, reproduction being vegetative. Nevertheless, it may be more widespread than the few scattered collections suggest. One collection, from the shore of Burt Lake (Cheboygan Co.) is a variegated form, presumably a horticultural escape.


Barry County
Berrien County
Charlevoix County
Cheboygan County
Gratiot County
Hillsdale County
Leelanau County
Oakland County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. September 27, 2022.