Iris pseudacorus L.
Common Name: YELLOW FLAG
Coefficient of Conservatism: *
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Ad P-Forb

A European species, locally spread from cultivation into wet lake shores, river edges, marshes, and ditches; sometimes forming dense stands. First collected in Wayne Co. in 1932.

This is a robust species, larger than our native Iris species, and forming dense colonies. Striking when in flower, fruiting plants can be identified as noted in the key. The seeds are round, as often the case in I. virginica, but more smooth, lacking the conspicuously pitted surface typical of I. virginica.  


Alcona County
Allegan County
Arenac County
Benzie County
Berrien County
Chippewa County
Emmet County
Gogebic County
Hillsdale County
Houghton County
Huron County
Ingham County
Jackson County
Kalamazoo County
Kent County
Leelanau County
Lenawee County
Livingston County
Mason County
Monroe County
Oakland County
Ottawa County
Saginaw County
Tuscola County
Washtenaw County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. September 30, 2022.