Description from Flora of China
Plants 28-33 cm tall. Tubers cylindric-oblong, ca. 2.5 cm × 8 mm, fleshy. Stem erect, terete, stout, ca. 3 mm in diam., with 1 or 2 tubular sheaths at base, with (4-)6-10 leaves ± in a rosette and many bractlike leaves above. Leaf blade linear-lanceolate, 7-9 × 0.8-1.1 cm, base contracted into amplexicaul sheath, apex acute or acuminate. Raceme 10-25-flowered, 6-17 cm; floral bracts lanceolate, basal ones nearly as long as ovary, apex acuminate; ovary twisted, terete, including pedicel 8-12 mm. Flowers yellowish green or white. Dorsal sepal forming a hood with petals, erect, broadly ovate, concave, ca. 5 × 2.9 mm, 3-veined, apex obtuse; lateral sepals reflexed, narrowly ovate, ca. 6 × 2.4 mm, 2-veined, apex subobtuse. Petals obliquely ovate-ligulate, falcate, ca. 4.5 × 1.2 mm, 1-veined, apex acute; lip deeply 3-lobed from base; lateral lobes spreading at right angles to mid-lobe, filiform, ca. 14 mm; mid-lobe linear, ca. 7 mm, wider than lateral lobes; spur pendulous, cylindric-clavate, ca. 14 mm, longer than ovary, slender, apical half ca. 1.4 mm in diam., slightly thickened toward end, apex acute or obtuse; connective wide; stigmas clavate. Fl. Oct.
● Forests, along rivers; 700-1600 m. S Guangxi, S Yunnan.