Triodanis perfoliata (L.) Nieuwl.
Common Name: VENUS'S LOOKING-GLASS
Synonym: Specularia perfoliata
Coefficient of Conservatism: 6
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt A-Forb

Sandy, barren, open ground; dry fields and bluffs; sometimes in moister sites; savanna with oak, pine, sassafras, especially at clearings, trails, roads; occasionally a garden weed. The O. A. Farwell Houghton Co. collection in 1935 was from “Vicinity Lake Linden cemetery incline.”

Rarely the stems are lax and sprawling rather than erect. The leaves are short-ovate or even nearly reniform, with a few coarse teeth, and are very different from the ovate-elliptic ± acuminate leaves of Campanulastrum americanum, which also has ± rotate corollas but grows in rich habitats and has larger flowers (corolla lobes ca. (7–) 8–13 mm long, compared to 6–8 mm in Triodanis).

Locations

Allegan County
Barry County
Benzie County
Berrien County
Cass County
Cheboygan County
Hillsdale County
Houghton County
Ingham County
Ionia County
Jackson County
Kalamazoo County
Kent County
Lapeer County
Lenawee County
Macomb County
Mecosta County
Monroe County
Montcalm County
Muskegon County
Newaygo County
Oakland County
Oceana County
St. Clair County
St. Joseph 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=710.