Terrestrial. Stem cylindrical, rather fleshy, 15-25 cm long, 2.5-3 cm in diam., covered by sheaths, 3-5-leaved near top. Leaves obliquely elliptic, 15-25 cm long, 6-12 cm wide, apex acute, base decurrent into a broad sheath enclosing stem, plicate, mainly 7-9-nerved; sheath 5-9 cm long, 2.5 cm wide. Peduncle and rachis yellowish green, 20-30 cm long, ca. 7 mm in diam., distinctly ridged; bracts green, triangular, 4-5 mm long; pedicel and ovary green, 12-15 mm long, with 3-5 thin raised ridges. Flowers 5-15, greenish yellow; dorsal sepal linear-oblong, 13-16 mm long, 3-4 mm wide, acute at apex, revolute; lateral sepals similar to dorsal sepal, slightly oblique, revolute, often slightly twisted; petals linear, 12-15 mm long; lip obovate-cuneate, 12-15 mm long, 8-11 mm wide, base with erect thick entire margins, reflexed from near middle, apical margin distinctly serrulate; disc with 2 calli at base, theae continuous into raised longitudinal ridges for 2/5 length of lip; column arcuate, 6-7 mm long, inconspicuously winged. Capsules ellipsoid, 2.5-3 cm long, pedicel 1-1.5 cm long. Seeds linear-fusiform, 1-1.5 mm long.

TAIPEI: North Chiatienshan, Su & Chen s. n. Sep 1985. ILAN: Nanao, Su et al. 7915, 7908. NANTOU: Chitou, Su 7047. KAOHSIUNG: Dona, Su et al. 7542, 7549. TAITUNG: Chingshuiying, Su s. n. Apr 1970; Hsinkangshan, Su & Chen 7717. HUALIEN: Yuli, Su & Hsu 8274; Nungkao, Su 9374.

Endemic, broadleaved forests, 500 to 1,500 m throughout.