Plants 6–26 cm. Pseudobulbs ovoid, 10 × 5 mm, sheathed by bracts and persistent leaf bases, previous year’s pseudobulb usually present, connected by short rhizome. Stems pale green or yellowish green, angled, sometimes obscurely winged or fluted distally. Leaves 2; blade conduplicate, green, glossy, oblong-elliptic to elliptic-lanceolate, keeled abaxially, 3.7–18 × 1–4 cm, succulent, apex obtuse to subacute. Inflorescences 2–10 cm; floral bracts subulate, minute, 2 × 1 mm, apex acute; pedicels slender, 3–5 mm. Flowers 2–15, green or yellowish green to yellowish white or greenish white; dorsal sepal oblong-lanceolate to narrowly lanceolate, 4.5–6 × 1–2 mm, apex obtuse to acute; lateral sepals oblong-lanceolate to narrowly lanceolate, 4.5–5.5 × 1–2.2 mm, apex obtuse to acute; petals pendent, slightly curved, tubular, filiform, 4.5–5.5 × 0.5–1 mm, margins strongly revolute; lip translucent to opaque, green or yellowish green to yellowish white, obovate to oblong to suborbiculate, 4–5.5 × 2.2–3.5 mm, base narrowly cuneate, slightly auriculate, margins crenulate-wavy, apex subtruncate to obtuse, mucronate; disc with central elongate thickening; column short, stout, 2–3 × 0.5–1 mm, winged apically; anthers yellow; pollinia yellow. Capsules: pedicel 3–7 mm; body obovate to ellipsoid, 9–13 × 3–6 mm, veins often slightly winged. 2n = 32, 26.
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Scape 1–2.5 dm, with a loose raceme of 2–12 fls; lvs lanceolate to elliptic, 5–15 × 2–3(–5) cm, somewhat folded along the midrib; pedicels 3–5 mm; sep yellowish-green, 5–6 mm; pet yellowish-green, 5 mm, somewhat reflexed; lip 5 mm, ascending at the narrowed base, the blade yellowish-green, broadly ovate with upturned margins; column 3 mm; 2n=32. Damp or wet woods; N.S. and Que. to Man., s. to N.J., O., Nebr., Kans., Mo., and in the mts. to Ala.; Europe. June, July.
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