Scape 1–3 dm; lf solitary, sessile, oval or elliptic, 3–6 cm, a third to half as wide; infl flattened or broadly rounded at the summit; pedicels 4–8 mm; upper sep elliptic, obtuse, erect, 1.3–1.5 mm; lower sep similar, spreading or deflexed; lateral pet linear, 1 mm, recurved behind the fl; lip lowermost, greenish, oblong in general outline, 2–2.5 mm, its basal angles prolonged into auricles behind the fl, its summit deeply 2-lobed, with a small central tooth in the sinus. Damp woods and bogs; Nf. and Que. to Man., s. to Fla., Tex., W.I., and C. Amer. (Microstylis u.)