Plants 30-60 cm tall. Tubers narrowly elliptic, 3-4 × 2-3 cm, fleshy. Stem erect, stout, base with 4 or 5 ± tufted leaves and above leaves several bractlike leaflets. Leaf blade oblong-lanceolate or narrowly elliptic, 14-25 × 3-6 cm, base contracted and amplexicaul, apex acute. Raceme many flowered, 8-16 cm; floral bracts ovate-lanceolate, 2-4 cm, apex acute or acuminate; ovary twisted, cylindric-fusiform, including pedicel 1.5-2 cm. Flowers white. Dorsal sepal forming a hood with petals, broadly ovate, concave, 1.3-1.5 cm; lateral sepals spreading or reflexed, obliquely subovate, 14-16 × 6-7 mm. Petals linear-lanceolate, 1.3-1.5 cm, apex acute; lip 2.3-2.5 cm, narrow, below middle deeply 3-lobed; lobes linear, 1.5-1.7 cm; lateral lobes filiform, narrower and slightly longer than linear mid-lobe; spur pendulous, cylindric-clavate, slightly thickened toward end, 3-6 cm. Fl. Jul-Aug.
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