Plants 20-45 cm tall. Rootstock elongate, creeping, tapering, 3-8 × 0.3-0.6 cm, stoloniferous. Stem erect, with 1 or 2 tubular sheaths at base, 1-or 2-leaved. Leaves cauline, alternate, widely spaced, oblong-oblanceolate, 8-12 × 3-3.5 cm, base cuneate, apex subacute. Peduncle slender, ridged, with 2 foliaceous, lanceolate bracts; rachis 8-18 cm, 5-20-flowered; floral bracts lanceolate, 6-16 mm. Flowers greenish; pedicel and ovary fusiform, 6-9 mm. Dorsal sepal forming a hood with petals, ovate-triangular, 3-3.5 × 2.8-3.3 mm, glabrous, 1-veined, apex obtuse; lateral sepals reflexed, ovate-lanceolate, oblique, 4.5-5.5 × 2-3 mm, glabrous, 1-veined, apex obtuse. Petals lanceolate, oblique, 4-4.5 × 1.8-2 mm; lip ovate-triangular, 4.5-5 × 1.8-2.5 mm, entire, apex obtuse; spur pendulous, incurved, 6-8 mm, apex obtuse. Column 1.5-2 mm, with 2 small projections linking to lip at base; staminodes conspicuous; anther locules slightly divergent; connective narrow; pollinia ellipsoid, with slender caudicles and large, oblong viscidia; rostellum curved; stigma lobes confluent, flat, anterior margin protruding beyond anther locules. Fl. Jul-Sep.
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