Plants 7-25 cm tall. Tubers ovoid or ellipsoid, 0.5-1.5 cm, fleshy. Stem erect or ascending, terete, glabrous, with 2 nearly opposite leaves at base and 2-5 bractlike leaves above. Leaf blade cordate or nearly reniform, 1.2-3.5 × 1-5 cm, base contracted into amplexicaul sheath, apex acute. Raceme loosely 1-to several flowered; rachis glabrous; floral bracts ovate-lanceolate, 4-7 mm, shorter than ovary, apex acuminate; ovary twisted, terete, including pedicel 10-11 mm, glabrous. Flowers greenish white, small. Dorsal sepal forming a hood with petals, erect, ovate, concave, ca. 5 × 4 mm, 1-veined, apex obtuse-rounded; lateral sepals reflexed, oblong, ca. 6 × 3 mm, 3-veined, apex acute. Petals straight, linear-lanceolate, ca. 5 × 1 mm, 1-veined, apex acute; lip 13-15 mm, from base deeply 3-lobed, lobes filiform; lateral lobes longer than mid-lobe, 13-15 mm, often curled upward toward apex; spur pendulous, subclavate, 5.5-9 mm, shorter than ovary, apex subacute; stigmas narrowly clavate. Fl. Jun. 2n = 42, 42 + 2B, 108.
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