Plants terrestrial or lithophytic. Leaves 4-8, distichous; blade abaxially green and toward base spotted with purple, adaxially deep green, oblanceolate-oblong to narrowly oblong, 28-40 × 2.6-3.4 cm, unequally bilobulate or tridenticulate at apex. Scape suberect, terminating in a solitary flower; peduncle green, 13-28 cm, purple pubescent; floral bract green, subelliptic-ovate, 3.5-4.7 × 2-2.5 cm; pedicel and ovary 5-6.5 cm, purple pubescent. Flower 7-8 cm in diam.; dorsal sepal white, often pale green or brown-green toward its base, spotted with deep purple in basal 2/3; synsepal white, often with 2 rows of purple spots centrally; petals yellow-brown, with deeper color on upper side of midvein than on lower side; lip pale yellow-brown; staminode pale yellow, slightly flushed with brown. Dorsal sepal broadly elliptic or suborbicular, 5-5.5 × 3.8-4.6 cm, ± puberulent abaxially, ciliate, basal margin recurved, apex acute; synsepal elliptic or ovate-elliptic, 4.2-5 × 2.2-2.7 cm. Petals spatulate, 5.2-5.5 × 2-2.5 cm, margin often undulate and recurved, apex retuse to 3-dentate; lip helmet-shaped; pouch ovoid, 2.8-3.1 × 2.4-2.7 cm. Staminode obcordate, 10-11 × 10-11 mm, adaxially with bubblelike papillae and a central umbo, purple hairy toward its base. Fl. Sep-Dec. 2n = 26.
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