Plants 40-89 cm tall. Tubers oblong or narrowly ellipsoid, 2-5 × 1-2 cm, fleshy. Stem erect, terete, stout, with 5-8 leaves near middle and many bractlike leaves above. Leaf blade elliptic or oblong to oblong-lanceolate, 8-16 × 3-5.5 cm, base contracted into amplexicaul sheath, apex acute or acuminate. Raceme densely many flowered, 10-20 cm; floral bracts lanceolate or ovate-lanceolate, 1.5-2.8 × 0.4-0.6 cm, often longer than flowers, apex aristate; ovary twisted, cylindric-fusiform, including pedicel 1.5-2.2 cm, glabrous. Flowers green or greenish white. Dorsal sepal erect, ovate-elliptic, concave, 1.4-1.6 × 0.4-0.5 cm, 3-veined, apex long acuminate or caudate-aristate; lateral sepals reflexed, obliquely ovate, 1.6-1.8 × 0.5-0.6 cm, 3-veined, apex long acuminate or caudate-aristate. Petals slightly shorter and narrower than dorsal sepal, 2-lobed; upper lobe linear, 10-13 × 1-1.8 mm, 1-veined, apex acuminate; lower lobe narrowly falcate, small, ca. 2.5 mm; lip brownish, 10-15 mm, deeply 3-lobed from base; lateral lobes linear or subulate, shorter than mid-lobe; mid-lobe linear or ligulate, wider than lateral lobes; spur pendulous, cylindric, 15-26 mm, ca. as long as or longer than ovary, apex obtuse; stigmas oblong-clavate. Fl. Aug-Oct. 2n = 40, 42.
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