Lip ovate to ovate-oblong, 5-7.5 mm, margins thin, delicately crisped, fringed, apex truncate. Flowering Aug--Sep. Mesic to dry open sites in meadows, barrens, open woodlands, outcrops, roadsides, sand pits, old fields; of conservation concern; 0--550 m; N.S., Ont., Que.; Maine, Mich., N.H., N.Y., Pa., Vt., Wis.