Plant cespitose, to 100 cm. Roots basal, 1–2.5 mm diam. Stems unbranched, straight, terete proximally, compressed distally, to 90 cm. Leaves 4–10, evenly distributed on distal 1/2 of stem; petiole to 46 mm; blade elliptic, 2-lobed, 6–15 × 0.5–3 cm, leathery. Inflorescences nearly corymbose; peduncle zigzag, branching with time, greater than 5 mm, producing flowers over several years. Flowers resupinate, produced in succession, 1–2 at a time; sepals yellowish, narrowly linear-lanceolate, to 60 × 6 mm, apex acute; petals yellowish, narrowly linear-lanceolate, to 58 × 2 mm; lip white, deeply 3-lobed, middle lobe narrowly linear-acuminate, overall to 24 × 40 mm, lateral lobes obliquely semiovate; callus yellow; column 18 mm; clinandrium hood surpassing anther, erose; anther ovoid; ovary 45–50 mm. Capsules ellipsoid; pedicel 7–14 mm; body 25–32 × 10–15 mm; beak 16 mm.
