Rhizome creeping, rather robust, 5-7 mm in diam., with many nodes, densely covered with scaly sheaths, with many roots. Pseudobulbs contiguous, suboblong, (2.5-)4-8 × 1-1.5 cm, obscurely obtusely 4-ridged, apex 1-leaved. Leaf blade oblong-oblanceolate, oblong, or nearly broadly oblanceolate, 7-25(-35) × 2-8.5 cm, thinly leathery, base cuneate, apex shortly acuminate or acute; petiole 1.5-5 cm. Inflorescence arising from young pseudobulbs with nearly mature leaf at anthesis, usually 25-50 cm; rachis nodding, 5-30 cm, densely many flowered; floral bracts persistent, often conduplicate, broadly ovate, 4-7 × 4-8 mm, with many dense veins, ± concave. Flowers white or slightly tinged with red; pedicel and ovary 4-5 mm. Dorsal sepal orbicular or broadly elliptic, cymbiform, 3-4.5 × 3-4.5 mm, 5-veined, midvein slightly raised; lateral sepals free, ovate, cymbiform, 4-6 × 3.5-4 mm, dorsally strongly carinate. Petals sublinear-lanceolate, 3-4.5 × 1-1.5 mm, 1-veined; lip saccate, 4-6 mm, slightly 3-lobed; lateral lobes embracing column, erect, nearly broadly oblong, 2.5-3 × ca. 2 mm; mid-lobe suboblong, 3-4 mm wide, margin slightly undulate, apex emarginate; disk with 2 or 3 longitudinal lamellae or thickened veins near base. Column nearly orbicular in ventral view, 3-4 mm, thick, both sides with wings; rostellum broad. Capsule obovoid-ellipsoid, 1-1.3 cm × 6-7 mm; fruiting pedicel 2-4 mm. Fl. Jul-Sep, fr. Oct-Jan. 2n = 40.
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