Plants 25-60 cm tall. Rootstock tuberous, clavate-fusiform, 1.5-6 × 0.4-0.9 cm. Stem erect, stout, with several tubular sheaths, 1-3-leaved. Leaves cauline, alternate, widely spaced, ovate-oblong to lanceolate, 8-15 × 2.5-5 cm, base clasping, apex obtuse. Peduncle with several scattered, foliaceous, lanceolate bracts; rachis 10-30 cm, subdensely to densely 10-40-flowered; floral bracts lanceolate, 8-27 mm, exceeding ovary. Flowers whitish green to nearly white; pedicel and ovary arcuate, cylindric-fusiform, 6-18 mm. Dorsal sepal forming a hood with petals, narrowly ovate, concave, 3-3.5 × ca. 2 mm, glabrous, 3-veined, apex obtuse; lateral sepals reflexed or spreading, ovate-lanceolate, falcate, 4-4.5 × ca. 2 mm, glabrous, 3-veined, apex obtuse. Petals oblong, oblique, 3-3.5 × 1.5-2 mm, 2-veined, apex obtuse; lip strongly deflexed, broadly linear, 5-7 × 1-1.2 mm, entire, apex obtuse; disk with an oblong callus in front of mouth of spur; spur spreading horizontally, slightly arcuate, cylindric, 10-20 mm, slender, apex obtuse. Column 2-2.5 mm; staminodes ellipsoid, small, inconspicuous; anther locules parallel; connective narrow; pollinia ellipsoid, with long caudicles and small, narrowly triangular viscidia; rostellum concave, V-shaped; stigma lobes confluent, concave, anterior margin slightly protruding. Fl. Jul-Sep. 2n = 42.
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