Corallorhiza maculata (Raf.) Raf.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Stem 2–6 dm, often pinkish-purple; infl 5–15 cm, fls 10–40; sep and lateral pet narrowly oblong to oblanceolate, 6–8 mm, 3(5)-nerved, the lateral sep somewhat divergent, the lateral pet ± spotted or suffused with purple; spur a prominent, sometimes divergent swelling near the ovary-tip; lip 6–8 mm, white, generally purple-spotted, with 2 rather small but evident lateral lobes below the middle and 2 short parallel ridges on the face, its terminal lobe rounded and deflexed, 3–4 mm wide. Woods; Nf. and Lab. to B.C., s. to Md. and Ind. and in the mts. to N.C., in the west to Mex. and C. Amer. July–Sept.