Terrestrial herbs. Roots 5-7 mm thick. Pseudobulbs ovoid-clavate, more or less compressed, 4-6 cm tall, 1-1.5 cm wide. Leaves usually 4-5 on pseudobulb, linear, 60-100 cm long, 1-1.8 cm wide, dark green, coriaceous, apex acute, narrowed at base, obscurely serrulate, midrib and lateral veins elevated on lower surface. Peduncle arising from base of pseudobulb, slender, 30-60 cm tall, with few well spaced sheaths on lower part; rachis more than 20 cm long; bracts linear-landceolate, 2.5-3 cm long, 3-4 mm wide; pedicel and ovary 4-4.2 cm long. Flowers 10 or more, greenish or purplish, fragrant, 6-8 cm in diam.; sepals linear-lanceolate to linear, 4-5 cm long, 4-5 mm wide, apex acuminate, with few reddish lines; petals lanceolate, 3-3.5 cm long, 8-10 mm wide, apex acute, slightly contracted at base, often with minute reddish dots near base, 7-nerved; lip ovate lanceolate, obscurely 3-lobed, lateral lobes erect, with transverse reddish lines and red margins, midlobe yellowish white, dotted with red spots, ovate, reflexed, more or less crenate, disc 2-keeled near base of midlobe; column whitish, 1.3-1.5 cm long, arched, with reddish spots on ventral side; anther semispherical, yellowish; pollinia 4, in 2 unequal pairs, attached to crescent-shaped viscidium.

TAIPEI: Wulai, Su 493. NANTOU: Hoshe, Su 8089.

Southern China, Korea and Japan. Taiwan, broadleaved forests, 800-1,400 m, usually near mountain ridges on southeast slopes.