Plants 30-60 cm tall. Rootstock creeping, cylindric, stoloniferous. Stem erect, stout, with tubular sheaths at base, 3-or 4-leaved. Leaves cauline, widely spaced, oblong, elliptic, or elliptic-lanceolate, 10-16 × 2.3-5 cm, base clasping, apex obtuse or acute. Peduncle with several lanceolate bracts; rachis 10-18 cm, subdensely to densely 8-26-flowered; floral bracts lanceolate, basal ones exceeding flowers, apex acuminate. Flowers pale yellowish green to whitish green; pedicel and ovary slightly arcuate, cylindric, 12-13 mm. Dorsal sepal erect, forming a hood with petals, ovate-elliptic, cymbiform, 4.5-5.5 × 3-3.5 mm, glabrous, 3-veined, apex obtuse; lateral sepals reflexed, broadly ovate, oblique, 4.5-5.5 × 3.2-3.6 mm, glabrous, 3-veined, apex obtuse. Petals linear, oblique, 4-5 × ca. 1.5 mm, 1-veined, apex truncate-obtuse; lip pendulous, linear-ligulate, 9-10.5 × ca. 1.5 mm, with small lateral lobes at base, margin reflexed, apex obtuse; disk with a conic callus in front of mouth of spur; basal lobes square, apex truncate; spur pendulous, cylindric, exceeding ovary, tapering gradually toward apex, apex acute and slightly hooked. Column short; staminodes conspicuous; anther locules parallel; connective somewhat broad, apex subretuse; pollinia obovoid, with long, slender caudicles and linear-elliptic viscidia; rostellum erect, broadly triangular, short; stigma lobes confluent, concave, elliptic, lying directly below rostellum. Fl. Jul-Aug.
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