Corallorhiza maculata var. occidentalis
Enum. Orchids U.S. & Canada, 22. 1924.
Inflorescences: floral bracts averaging 1–2.8 mm, often forked. Flowers: middle lobe of lip distinctly expanded, ratio of width of dilated part to base of middle lobe greater than than 1.5; column curved, 3.5–7.8 × 1–1.3 mm at stigma; stigmatic surface oblong-pentagonal, 0.8 × 1.3 mm.
Phenology: Flowering Apr–Jul.
Habitat: Coniferous and mixed woods, and conifer plantations
Elevation: 0–3700 m
Distribution
St. Pierre and Miquelon (variety unconfirmed), Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Sask., Ariz., Calif., Colo., Conn., Idaho, Ill., Maine, Mass., Mich., Minn., Mont., Nebr., Nev., N.H., N.Mex., N.Y., Oreg., Pa., S.Dak., Utah, Vt., Va., Wash., Wis., Wyo.
Discussion
Where they occur together, Corallorhiza maculata var. occidentalis typically flowers 2–4 weeks earlier than C. maculata var. maculata.
Selected References
None.