Stems tufted, erect, terete, 10-40 cm long, 3-5 mm in diam., slightly slender toward base, covered tightly by tube-like membranaceous sheaths; internodes cylindrical, 2-3.5 cm long, yellowish green or sometimes dark purple. Leaves lanceolate, 4-8 cm long, 7-15 mm wide, apex acute or obtuse or sometimes oblique, base rounded, articulated with sheath. Racemes lateral, from nodes of defoliated stems, with 1-4, often 2 flowers; peduncle 5-8 mm long; bracts imbricate, ovate-triangular, 3-5 mm long; pedicel and ovary 1.5-2 cm long. Flowers usually white, sometimes tinged with pale rose, rarely turning pale yellow, 2-3 cm in diam.; dorsal sepal, ovate-oblong or lanceolate or linear-lanceolate, 1.5-2.5 cm long, apex acute or obtuse or nearly rounded; lateral sepals similar to dorsal one, base oblique and adnate to foot of column forming mentum 8-10 mm long; petals oblong, as long as dorsal sepal, apex acute, clawed at base; lip erect to ascending, ovate or ovate-rhomboid, slightly shorter than sepals, apex acute, base cuneate, 3-lobed, lateral lobes erect, triangular or semiovate, terminal lobe ovate or triangular, disc glabrous, callous or sometimes hirsute between lateral lobes; column ca. 2 mm long, foot 8-10 mm long, concave; anther hood-like, 1.5 mm long; pollinia 1 mm long. Capsules obovate, 2-3.5 cm long.

TAIPEI: North Chiatienshan, Su et al. 6740; Tatungshan, Chang s. n. Apr 1972. ILAN: Nanao, Su 7837*; 7915. TAOYUEN: Tamanshan, Su & Chen 8485. HSINCHU: Yulao, Su & Chen 7838; 8245. MIAOLI: Tapachienshan Lin s. n. Aug 1972. TAICHUNG: Anmashan, Liu et al. s. n. Oct., 1957. NANTOU: Hoshe, Su 194; Salichien, Su et al. 8635. CHIAYI: Alishan, Sasaki s. n. Jan 1912; Alishan, Su & 8168. KAOHSIUNG: Dona, Su & Chen 7671; Tengtze, Segawa s. n. Mar 1934. TAITUNG: Tapushan, Su 191; Jyemaoshih, Segawa s. n. May 1936. HUALIEN: Chingshuishan, Su et al. 8651; Nengkao, Segawa s. n. Mar 1930.

China, southern Korea, Japan and northeast India. Taiwan, common in forests, 1,000-2,000 m, throughout.