Habenaria macrophylla Goldie, Edinburgh Philos. J. 6: 331. 1822; Platanthera orbiculata (Pursh) Lindley var. macrophylla (Goldie) Luer

Plants 23–63 cm. Leaves 2, in subequal basal pair lying on ground; bracts (very rarely, 0–)1–6, scattered along stem; blade broadly elliptic, orbiculate, or oblate, 7–24 × 5–19 cm. Spikes lax. Flowers resupinate, rather showy; calyx mostly greenish white; corolla mostly white; lateral sepals reflexed to somewhat spreading; petals lanceolate-falcate, margins entire; lip descending to somewhat reflexed, linear-oblong to linear-lanceolate, without basal thickening, 10–23 × 1–2.5 mm, margins entire; spur slenderly clavate, 28–46 mm; rostellum lobes directed strongly forward, wide-spreading, angular; pollinaria nearly straight, (4.6–)4.7–6.8 mm; pollinia remaining enclosed in anther sacs; viscidia orbiculate; ovary slender to rather stout, mostly 16–29 mm.

Flowering Jun--Aug. Mesic to wet coniferous and deciduous forest; mostly 0--1000 m; N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que.; Conn., Maine, Mass., Mich., Minn., N.H., N.Y., Pa., Vt.