Roots 3-4 mm in diam., densely hairy. Pseudobulbs elongate clavate, 6-15 cm long, fleshy, base 1-2 cm in diam., gradually tapering toward apex, narrowed into petiole, nodes 2-4, scales at nodes membranaceous. Leaves solitary, rarely 2, shortly petioled, oblong, 20-30 cm long, 7-10 cm wide, strongly plicate, mainly 5-nerved, apex acute, base decurrent; petiole articulated with pseudobulb. Scape 10-13 cm tall, base with many membranaceous scales; bracts ovate-oblong, 3 cm long; pedicel and ovary 3-3.6 cm long, glabrous. Flowers 4 or 5, crowded, with red stripes, tubular, 3.5-4.5 cm long; dorsal sepal elliptic, 2.3-2.5 cm long, 1.1-1.3 cm wide, obtuse; lateral sepals adnate to foot of column, triangular-falcate, 2.8-3.5 cm long, base 2.7 cm wide, oblique, apex acute, mentum with narrow tip; petals spatulate, 2-2.3 cm long, 1 cm wide, apex acute or obtuse, base narrowed; lip included in mentum, sagittate, 2.5 cm long, base long-clawed, apex 3-lobed, lateral lobes falcate, 1 cm long, central lobe triangular, with red spots or patches, disc with a yellow raised ridge between lateral lobes; column ca. 1 cm long, slightly curved, foot 1.8 cm long, often with red stripes and spots; anther white, 4 mm long, apex sharply pointed; pollinia clavate, 2-3 mm long, in 2 groups of 4, attached to a soft caudicle; rostellum exserted beyond stigma. Capsules erect, 5-6 cm long.

TAIPEI: Kingpingshan, Su 9007; Wulaishan, Su 7139*. ILAN: Nanao, Su 7852. HSINCHU: Chienshih, Su 7414. KAOHSIUNG: Liukuei, Su 36. PINGTUNG: Ako, Matuda s. n. Apr 1918. TAITUNG: Tapushan, Su 103.

The Himalaya, Indochina, southern China, Malaysia and Java. Taiwan, in broad-leaved forests below 1500 m throughout the island.