Description from Flora of China
Plants 10-50 cm tall. Rootstock tuberous, ovoid to fusiform, 3-8 × 0.4-0.8 cm. Stem erect, with 2 or 3 tubular sheaths at base, 1- or 2-leaved. Leaves basal or cauline, alternate, narrowly elliptic, oblong, or linear-lanceolate, 3-12 × 0.8-3 cm, base clasping, apex acute or obtuse. Peduncle slender to somewhat robust, distinctly ridged, with several foliaceous, lanceolate bracts; rachis 3-22 cm, laxly to subdensely 3-20-flowered; floral bracts lanceolate to ovate-lanceolate, 8-20 mm, equal to or exceeding ovary. Flowers pale greenish yellow to green; pedicel and ovary arcuate, narrowly fusiform, 10-14 mm. Dorsal sepal not connivent with petals, broadly ovate to cordate or deltoid, concave, 4-7 × 3-5.5 mm, glabrous, 3-veined, apex obtuse or bluntly rounded; lateral sepals spreading or reflexed, oblong-lanceolate to broadly lanceolate or linear-lanceolate, oblique, 5-9 × 1.3-3.5 mm, glabrous, 3-veined, apex acute to acuminate. Petals spreading, ovate-lanceolate or ovate-linear, oblique, 6-9 × 3-4 mm, 3-veined, apex acute or obtuse; lip pendulous, linear-lanceolate to ligulate, 7-10 × 1-2.5 mm, entire, apex obtuse; spur pendulous, spreading horizontally, or curving upward, cylindric, 8-30 mm, obtuse to acute. Column 3-4 mm; staminodes ellipsoid, conspicuous; anther locules divergent or parallel, connective 2-3 mm wide, apex emarginate; pollinia ellipsoid, with long caudicles and suborbicular viscidia; rostellum broadly triangular; stigma lobes confluent, transversely oblong, concave, lying directly below rostellum.
Forests, forest margins, alpine or moist grasslands; 300-3200 m. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Shandong, Sichuan, Taiwan, NE Yunnan, Zhejiang [Japan, Korea].