Isotria Rafinesque. Whorled Pogonia, Five-leaves, Fiveleaf Orchid.
A genus of 2 species, of e. North America. Cameron & Chase (1999) indicate that Isotria should perhaps be included in a more broadly circumscribed Pogonia (as was often done prior to 1922); Chase et al. (2015) retain it as a separate genus.
ID notes: Sterile Isotria is sometimes confused with Medeola. Medeola has a wiry stem, with floccose hairiness, at least toward the base. Isotria has a fleshier stem, lacking hairs.
Ref: Correll (1950); Mehrhoff & Homoya (2002) In Flora of North America Editorial Committee (2002a). Show full citations.