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Isotria Rafinesque. Whorled Pogonia, Five-leaves, Fiveleaf Orchid.

Key to Isotria

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: Cameron & Chase (1999); Chase et al. (2015); Correll (1950); Mehrhoff & Homoya (2002) In Flora of North America Editorial Committee (2002a). Show full citations.

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