Terrestrial or rarely epiphytic herb with clustered growth. Leaves 4–6, linearoblong, obtuse and tridenticulate at apex, up to 40 cm long, 3–5.5 cm wide, sparsely ciliate on basal margins, green, glabrous. Inflorescence 2–5-flowered; peduncle 30–50 cm long, purple to greenish brown, shortly pubescent; bracts ovate, acute, to 4.5 cm long, glabrous, pale yellow-green with purple stripes. Flowers large, 12–16 cm across; sepals and petals yellow with maroon veins, petals with maroon warts on basal margins, lip yellow, veined and more or less flushed purple; pedicel and ovary 5–7 cm long, glabrous or sparsely pubescent, pale yellow-green, striped purple. Dorsal sepal ovate, acuminate, 4.9–5.5 cm long, 2.5–2.9 cm wide. Synsepal similar, 5.3–5.5 cm long, 2.8–2.9 cm wide. Petals deflexed, linear-tapering, 9–10 cm long, 1 cm wide, papillose in apical part, sparsely ciliate on basal margins, usually helically twisted. Lip subporrect, 5–5.5 cm long, 1.8–1.9 cm wide, with narrow acute incurved side-lobes. Staminode convex, oblong to subquadrate, obtuse to retuse, 17 mm long, 12 mm wide, with hirsute sides. 2n = 26.