Plants slender, 16-45 cm tall. Tubers subglobose to oblong, 0.6-1.5 × 0.5-1 cm. Stem with 2 or 3 tubular sheaths at base, 2-or 3-leaved. Leaves subopposite or clustered at base of stem, oblong-lanceolate to ovate-lanceolate, 2.5-12 × 1-3.5 cm, apex acute. Inflorescence 14-40 cm; peduncle cylindric, slender; sterile bracts 3 or more, occasionally foliaceous, lanceolate, to 30 mm; rachis 5-16 cm, subdensely many flowered; floral bracts lanceolate, 6-12 mm, ca. as long as to slightly exceeding ovary, apex acuminate. Flowers erect, green to pale yellowish green or white; ovary 7-10 mm including pedicel, glabrous. Dorsal sepal erect, ovate-oblong, concave, 2.8-3.5 × ca. 1.8 mm, 1-veined, apex acute; lateral sepals erect to obliquely spreading, 2.8-3.5 × ca. 1.4 mm, 1-veined, apex acute. Petals connivent with dorsal sepal and forming a hood, ovate, 2.8-3.5 × ca. 1.5 mm, 1-veined, apex obtuse; lip usually deflexed, oblong-obovate, 3.5-4.2 × 1.8-2 mm, base concave, 3-lobed toward apex; disk with a large, subglobose callus near base; lateral lobes triangular-lanceolate, 1-1.6 mm, apex acute; mid-lobe ovate-ligulate, 0.8-1.4 mm, broader than lateral lobes, apex obtuse; spur pendulous, somewhat incurved, ovoid, ca. 1 mm, apex acute. Column 1-1.2 mm; viscidia elliptic, small. Fl. Jul-Oct. 2n = 44, 88.
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