Description from Flora of China
Plants 15-31 cm tall. Tubers oblong, ca. 2 cm × 8 mm, fleshy. Stem erect, terete, slender, near base with 3-6 leaves, with 2-5 bractlike leaves above. Leaf blade lanceolate or linear, 6-15 × 1-1.8 cm, base contracted into amplexicaul sheath, apex acuminate or acute. Raceme 8-19-flowered, 8-14 cm; floral bracts lanceolate, 4-12 mm, longer than ovary, apex acuminate; ovary twisted, cylindric-fusiform, glabrous, including pedicel 7-8 mm. Flowers yellowish greenish; sepals greenish. Dorsal sepal forming a hood with petals, broadly ovate, concave, ca. 3 × 2.8 mm, 1-veined, apex obtuse; lateral sepals spreading or reflexed, obliquely ovate-lanceolate, ca. 4.5 × 2 mm, 1-veined, apex obtuse. Petals erect, whitish green, obliquely ovate, concave, ca. 3.8 × 2 mm, 1-veined, apex obtuse; lip yellow, relatively long, deeply 3-lobed from base, lobes linear; lateral lobes divergent, ca. 6 mm, narrowed toward apex, apex obtuse; mid-lobe ca. 4 mm, apex obtuse; spur pendulous or slightly curved, cylindric, 8-11 mm, longer than ovary, slender, slightly thickened near end, apex obtuse. Fl. Aug-Sep.
● Humid places in forests or grasslands. Hong Kong.