Corallorhiza odontorhiza (Willd.) Nutt.
Common Name: FALL CORAL-ROOT
Coefficient of Conservatism: 8
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt P-Forb

Dry open oak forests; pine plantations; much less often in beech-maple forests or under tamarack.

The stem is ± bulbous or enlarged at the base in this species, unlike our other species. The commonest in Michigan is var. odontorhiza, with a closed perianth; var. pringlei (Greenm.) Freudenst. with an open perianth is scattered and uncommon. This is the latest species of Corallorhiza to bloom on Michigan. Flowering collections have been made from mid-August through September, with fruiting occurring through October. 

Corallorhiza odontorhiza clearly is increasing in Michigan as well as spreading northward. However, a Montmorency County record from 1947 is not mapped because it was purported to have been collected in June; presumably there was a label mix-up.

Locations

Alger County
Barry County
Benzie County
Berrien County
Calhoun County
Cass County
Charlevoix County
Clare County
Crawford County
Huron County
Kalamazoo County
Kalkaska County
Lake County
Lapeer County
Leelanau County
Lenawee County
Mason County
Midland County
Newaygo County
Oakland County
Ottawa County
Saginaw County
St. Clair County
St. Joseph 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 14, 2017. http://www.michiganflora.net/species.aspx?id=1800.