species, U.S., Canada, Europe, Asia.
is a segregate of Habenaria,
which in the broad sense is a worldwide genus of nearly 700 species. In the
strict sense, as presently accepted by most botanists, true Habenaria is
a primarily tropical genus of about 600 species that is represented in the United States by only 4 species of the southeastern Coastal Plain. The main separations
between these genera reside in details of floral morphology. See Platanthera
for the treatment of another, larger segregate of Habenaria that occurs