Terrestrial herbs. Root whitish, 7-10 mm thick. Pseudobulbs small and inconspicuous, usually enclosed by sheaths. Leaves 6-10, linear, 60-90 cm long, 8-12 mm wide, coriaceous, more or less stiff and erect, apex acute, recurved and becoming sulcate toward base, margins distinctly serrulate, midrib and lateral veins elevated on both surfaces. Peduncle producing from base of pseudobulb, 30-50 cm tall; racemes with 12-18 loosely arranged flowers; bracts lanceolate, 2-3 cm long, 4-5 mm wide, acute; pedicel and ovary 3-3.5 cm long. Flowers pale green, pale yellow or sometimes tinged with light purple, 5-7 cm in diam., fragrant; sepals oblong to oblanceolate, 2.4-3.2 cm long, 6-8 mm wide, acute or obtuse at apex; petals lanceolate, 2.2-2.6 cm long, 7-9 mm wide, often with red spots and median line near base; lip pale yellow or pale green, with many irregular large reddish patches, oblong, nearly unlobed, 2.2-2.6 cm long, 1.2 cm wide, hypochile with erect sides, epichile strongly reflexed and undulate, obtuse or rounded at apex, disc with 2 keels often joined at their apex; column pale yellow, 1.6-2 cm long, with minute reddish spots on ventral side; anther yellowish white; pollinia 4, in 2 unequal pairs, attached to triangular viscidium.

ILAN: Nanshan, Su 729. TAICHUNG: Lishan, Su 957. NANTOU: Hohuangshan, Hayata s. n. Apr 1925; Hoshe, Su 7694.

Southern China. Taiwan, on sunny grasslands or under sparse forests ranging from 1500 to 3000 m in elevations, usually associated with Miscanthus spp.