Osmorhiza longistylis (Torr.) DC.
Coefficient of Conservatism: 3
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt P-Forb

Rich, often moist (even swampy) deciduous forests; persistent after clearing and hence sometimes in fine stands along forest roads. Frequently growing with O. claytonii, but usually restricted to rich moist sites.

Ordinarily one can readily distinguish this species in the field from O. claytonii by its taller, stiffer habit with redder, more glabrous stems; the flowers tend to be larger (petals often ca. 1.5–2.2 mm long, at least on bisexual flowers) and, as they are more numerous in the umbellets (due mostly to a larger number of staminate ones), the plant is more showy. Bracts of the involucel tend to be broader than in O. claytonii (often over 1 mm). Rarely the stem is densely villous (var. villicaulis Fernald). Bruised foliage of O. longistylis has a licorice odor, while that of O. claytonii has a carrot-like odor.


Alcona County
Allegan County
Alpena County
Baraga County
Barry County
Bay County
Berrien County
Charlevoix County
Chippewa County
Clinton County
Delta County
Eaton County
Emmet County
Genesee County
Gogebic County
Gratiot County
Hillsdale County
Houghton County
Ingham County
Ionia County
Kalamazoo County
Kent County
Lapeer County
Leelanau County
    Only on Fox Islands
Lenawee County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Marquette County
Mecosta County
Midland County
Monroe County
Newaygo County
Oakland County
Oceana County
Ontonagon County
Otsego County
Ottawa County
Saginaw County
Schoolcraft County
Shiawassee County
St. Clair County
Tuscola 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. December 3, 2022. https://michiganflora.net/species.aspx?id=132.