Roots flattened, to 50 cm. Stems short, enclosed in leaf sheaths. Leaves 3-5, subbasal, deciduous, or 1 or 2 persistent in winter, oblong to elliptic, 4.5-7 × 3-3.6 cm, base broadly cuneate-rounded, apex obliquely obtuse to acute. Inflorescences 3 or 4, arising from base of stem, racemose, 8-15 cm, laxly 3-or 4-flowered; peduncle green, with 2-4 membranous sheaths; rachis straight; floral bracts yellow-green, triangular-lanceolate, 2-4 mm, acuminate. Flowers 1.2-1.6 cm in diam., sepals and petals white, sometimes tinged yellowish, lip white and orange or orange-yellow, tinged brownish on disk and central part of mid-lobe, column white with 1 or 2 crescent-shaped or semiorbicular brown markings at base in front; pedicel and ovary white tinged pale green, 1-1.3 cm. Dorsal sepal oblong-elliptic, 7-9 × 3-4 mm, obtuse; lateral sepals obliquely ovate-elliptic, 6-7 mm, 4-5 mm wide at base, base adnate to column foot, sometimes dorsally carinate. Petals spatulate or narrowly obovate, 6-8 × 2-3 mm, rounded; lip 3-lobed; lateral lobes erect, subparallel, diverging in middle to form a U-shaped compound structure, sublanceolate, 2-3 mm, with 2 orange and brownish tinged calli on disk in between; mid-lobe mobile, broadly triangular, 4-5 × 6-7 mm, 3-lobulate; basal callus deeply forked, with a crested crescent-shaped appendage transversely lying near middle, each arm of callus dividing into 2 filiform-linear antennae to 3 mm. Column 4-5 mm, foot 1-2 mm. Fl. Apr-May.
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