Plants 11–60 cm. Pseudobulbs 5–15 mm diam. Leaves 1, at middle or proximal 1/3 of stem, sheathing leaf bases persistent, shredding; blade ovate-elliptic or oblanceolate, keeled abaxially, 2.4–15 × 1–5.2(–6) cm, apex acute. Inflorescences spicate racemes, rachis thick, slightly ridged or fluted, 6–22 cm; floral bracts triangular to lanceolate, 0.5–1 mm; pedicels 1.3–1.7 mm. Flowers 40–160, not resupinate, green to yellowish green; dorsal sepal ovate to elliptic, 1.5–2.8 × 0.8–1.3 mm, apex acuminate; lateral sepals ovate to elliptic, falcate, 1.5–2.8 × 0.8–1.3 mm, apex acuminate; petals strongly reflexed, filiform to linear, falcate, 1.3–2 × 0.2–0.3 mm, apex acuminate; lip suborbiculate-ovate to subquadrangular-ovate, 1.5–2.8 × 1.3–2.2(–2.5) mm, base hastate-auriculate, apex obliquely 3-dentate or retuse with apiculum in sinus; disc deeply concave, 5-veined; column 0.2–0.5 × 0.2–0.5 mm; pollinia yellow. Capsules ascending, ellipsoid, 7 × 3 mm.
