Plants 15-45 cm tall. Tubers oblong, to 3.5 × ca. 1.5 cm, fleshy. Stem erect, terete, slender, with 3 or 4 leaves near middle and 2 or 3 bractlike leaves above. Leaf blade lanceolate or ovate-lanceolate, 2.5-5.2 × 0.8-1.2 cm, base contracted into amplexicaul sheath, margin very narrow and membranous, apex acuminate. Raceme 2-9-flowered; floral bracts ovate-lanceolate, concave, ca. 2.4 cm, often longer than ovary, apex long acuminate; ovary twisted, cylindric-fusiform, including pedicel 18-20 mm, glabrous. Flowers whitish green. Sepals abaxially green, adaxially white, 8-9 × 3.5-4.5 mm, 3-veined, apex acute; dorsal sepal concave-hooded, erect, narrowly ovate; lateral sepals reflexed, obliquely ovate, concave. Petals white, obliquely ovate, 9-11 × ca. 2 mm, deeply 2-lobed from base; upper lobe shorter and broader than lower lobe, basal half connivent with dorsal sepal, apical half spreading, knife-shaped; lower lobe filiform, apex often curved; lip pale green, 9-12 mm, deeply 3-lobed from base; lobes linear-filiform; lateral lobes ca. as long as but narrower than mid-lobe; spur pendulous, yellowish green, base narrow and whitish, 22-24 mm, longer than ovary, slender, with widest part near middle, becoming narrower toward both ends; pollinia subglobose; caudicles 3.5-4 mm; viscidia narrowly elliptic, ca. 0.5 mm; stigmas yellowish white, broadly bean-shaped. Fl. Oct.
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