Ranunculus flabellaris Raf.
Common Name: YELLOW WATER CROWFOOT
Coefficient of Conservatism: 10
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

Standing water of swamps, forest pools, ponds, ditches, marshes; very local northwards.

Even in the absence of the distinctive corky-winged achenes, this species is usually easily distinguished from R. gmelinii by its larger size, especially in the flowers but in general also in foliage (although the submersed leaves of R. gmelinii may be quite large, usually with segments broader on the average than in the finer submersed leaves of R. flabellaris).

Flowers produced at the end of the blooming period are sometimes unusually small, resembling those of R. gmelinii. At this time, however, copious fruits will be available to see the distinctive large, long-beaked achenes. 

Plants of both species produce smaller, less limp, less extensively lobed leaves when stranded on moist shores than they do when submersed.

This is a showy, large-flowered species, and ponds full of the bright yellow flowers in mid-May, before anything else in the adjacent wet woods is in bloom are very eye-catching. 

Locations

Benzie County
Berrien County
Charlevoix County
    Only on Beaver Island
Chippewa County
Eaton County
Gratiot County
Hillsdale County
Huron County
Ingham County
Ionia County
Jackson County
Kalamazoo County
Kent County
Lenawee County
Livingston County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Macomb County
Midland County
Monroe County
Newaygo County
Oakland 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 18, 2017. http://www.michiganflora.net/species.aspx?id=2389.