Rhizomes inconspicuous, often not well developed between pseudobulbs; root rigid and stout, 4-5 mm in diam. Pseudobulbs green or purplish, elongate-ovoid, 3.5-5 cm long, 12-15 mm thick, fleshy, often covered by scale-like sheaths. Leaves erect, elliptic or oblong, 16-20 cm long, 5-7 cm wide, apex acute, base cuneate, entire, 3-nerved, more or less lustrous on upper surface; petiole 4-6 cm long,shal-lowly sulcate above. Peduncle erect, 20-35 cm tall, glabrous, remotely 2-3 sheathed; sheaths tubular, 34 cm long; rachis 5-9 cm long; bracts lanceolate, 7-10 mm long, acuminate; pedicel and ovary 10-15 mm long. Flowers subspreading, reddish brown or pale brown and tinged with red, glabrous; dorsal sepal linear, 14 mm long, 2 mm wide, acute; lateral sepal similar to dorsal but shorter and more or less falcate; petals linear-oblong, 13 mm long, 3.5 mm wide, sometimes marked with sparse dots or strips; lip yellowish, recurved, obovate-cuneate, 10-13 mm long, 7-9 mm wide, apex 3-lobed, base clawed and articulated with foot of column, central lobe 2.5 mm long, 6 mm wide, truncate, lateral lobes smaller, acute to obtuse, with dense red spots, disc with 3 keels; column slightly curved, yellow, semiterete, 7-9 mm long, with red trips on ventral side, foot 2 mm long; anther rectangular, 1.5 mm tall, with 2 dark red horns at corners; pollinia 8, compressed ovoid, 2 pairs, each in 2 collateral rows.

TAOYUEN: Kueihui, Su et. al. 8837. HSINCHU: Chutung, Fukuyama s. n. Oct 1932. CHIAYI: Fenchihu, Lin 61. PINGTUNG: Linungshan, Su & Chen 8600*; Nanjenshan, Su 8051.

Southern China, northeast India, the Himalaya, Thailand and Vietnam. Taiwan, forests, 400-1,500 m, throughout, relatively rare.