Stem ± strongly thickened, base not bulbous. Inflorescences: racemes lax to dense, 10-67 × 1.2-4.5 cm. Flowers 2-35, chasmogamous, conspicuous to showy; perianth open and spreading to connivent; sepals and petals salmon reddish purple with darker veins or pure yellow, lanceolate to oblanceolate, 3-5-veined; lip obovate, unlobed, 3.2-16.5 × 2-6.2 mm, thickened, margins deep red with white or yellow at base, or pure yellow, upturned, giving boat-shaped appearance especially toward apex; callus formed by partial connation of 2 basal lamellae, less than 1/3 length of lip; column pure yellow or yellow spotted with red, curved toward lip, 3-6 mm, base without auricles or ridges; ovary 3-8.5 mm; mentum absent. Capsules ellipsoid, 11-30 × 5-10 mm.