A terrestrial or lithophytic herb. Leaves suberect, 4–5, linear, obtuse to rounded at unequally bilobulate apex, up to 35 cm long, 1.8–3 cm wide, yellowish green. Inflorescence 1-flowered; peduncle 13–18 cm long, slender, green, shortly purple-pubescent; bract narrowly elliptic to elliptic, obtuse, 4–4.4 cm long, 2–2.4 cm wide, green to yellowgreen. Flower c. 6.5 cm across; dorsal sepal white, with raised maroon spots on yellow central half; synsepal pale yellow-green with darker veins; petals glossy, pale buff-yellow with darker veins; lip glossy, buff with darker veins; pedicel and ovary yellow-green, pubescent, 2.2–4 cm long. Dorsal sepal ovate-elliptic, obtuse, 3–4.8 cm long, 2.8–3 cm wide, pubescent on outer surface. Synsepal oblong-elliptic, obtuse, 3.4–4.7 cm long, 1.6–2.5 cm wide. Petals incurved, subhorizontal, oblanceolate to narrowly oblong, obtuse, 4.3–5 cm long, 1.4–1.7 cm wide, ciliate, purple-pubescent at base, margins undulate. Lip 3–3.5 cm long, 1.9 cm wide. Staminode obovate, obtuse to rarely retuse, 6–8 mm long, 7–9 mm wide. 2n = 26.