Plants 40-70 cm tall. Tubers oblong, 3-5 × 1-2.5 cm, fleshy. Stem erect, terete, stout, with 6 or 7 leaves near middle and 2-7 bractlike leaves above. Leaf blade oblong-lanceolate or obovate-lanceolate, 13-15 × 3.5-4.5 cm, base contracted into amplexicaul sheath, apex acute or acuminate. Raceme densely many flowered, 8-20 cm; floral bracts lanceolate, 18-24 × 2.5-4 mm, ca. as long as or longer than ovary, apex long acuminate; ovary twisted, cylindric, including pedicel 1.8-2.2 cm, glabrous. Flowers green. Dorsal sepal erect, ovate-lanceolate, concave, 1.2-1.5 × 0.4-0.6 cm, 3-veined, apex long acuminate-caudate; lateral sepals reflexed, slightly oblique, ovate-lanceolate, 1.4-1.5 × 0.4-0.6 cm, 3-veined, apex long acuminate-caudate. Petals deeply 2-lobed from base; lobes divaricate, filiform; upper lobe 1.1-1.4 cm; lower lobe 1.8-2 cm; lip deeply 3-lobed from base; lobes filiform, 1.8-2.5 cm × ca. 0.8 mm, sometimes mid-lobe shorter than lateral lobes; spur pendulous, cylindric, 1.8-2.3 cm, ca. as long as or longer than ovary, slightly thickened toward end; pollinia oblong; viscidia orbicular, small; stigmas clavate. Fl. Aug-Oct. 2n = 42, 42 + 2B.
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