Plants 30-50 cm tall. Pseudobulbs tufted, globose-ovoid, 1.5 cm long, with 2 or 3 nodes. Leaves 2 or 3, lanceolate, 30-40 cm long, 4-7 cm wide, apex acuminate, base cuneate, gradually narrowed into petiole; petiole 5-15 cm long. Scapes 40-50 cm long, green or tinged with purple, rachis 5-10 cm long; bracts lanceolate, 1-2 cm long; pedicel and ovary 3-4 cm long, ovary nearly glabrous, with 6 sharp raised ridges. Flowers 5-10, loosely spaced, white or tinged with light purple, widely opening; dorsal sepal lanceolate-ovate, 20-25 mm long, 9-11 mm wide, acuminate at apex, slightly contracted at base; lateral sepals similar but +/-longer and oblique, 25-27 mm long, 10 mm wide, acute at apex, strongly contracted at base; petals linear lanceolate, 18-20 mm long, 4 mm wide; lip adnate to column at base, spurred, orbicular, 13-15 mm long, 18-20 mm wide, 3-lobed, central lobe orbicular, 9 mm across, aristate at apex, undulate-crisped, lateral lobes falcate, ovate, entire or slightly undulate, disc often with 3 low ridges near base, spur 1-1.5 cm long, slender, slightly incurved; column 7-9 mm long, connate ventrally with base of lip; anther white, elongate, cordate, 4 mm long; pollinia yellowish white, in 2 groups of 4 (2 long and 2 short), attached to a oblong viscidium; stigma a solitary large cavity; rostellum short, bifid. Capsules to 5 cm long, with sharp wing-like ridges.

TAIPEI: Chingpingshan, Su 560. TAOYUEN: Litungshan, Su 8226. ILAN: Nanshan to Chiliting, Ou & Liao 3812. HSINCHU: Wutzeshan, Su et al. 8830. MIAOLI: Manapanshan, Su & Chen 8861. TAICHUNG: Anmashan, Liu et al. s. n. Oct 1957; Pahsienshan, Su & Chen 8166. NANTOU: Fonghuang, Hayata s. n. 1916; Su 6952. CHIAYI: Alishan, Kawakami & Mori s. n. 1908; Ou & Lu 3628. KAOHSIUNG: Donna, Su & Chen 7522. PINGTUNG: Kueihu, Chen et al. s. n. Jan. 1975; North Tawu, Su 9364. TAITUNG: Doushan, Su & Chen 8887; Hsingkangshan, Su & Chen 7699. HUALIEN: Chinshuishan, Su & Hsu 8176; Wangzong, Kao 473.

Endemic. Common in forests from 1,000 to 2,000 m throughout the island.