Plants 35-85 cm tall. Rootstock elongate, creeping, cylindric, narrow, stoloniferous. Stem erect, with 1 or 2 tubular sheaths at base, 4-6-leaved. Leaves cauline, alternate, widely spaced, linear-lanceolate to broadly linear, 7-20 × 0.8-2 cm, base clasping, apex acuminate or acute. Peduncle slender, with several scattered lanceolate bracts; rachis 5-20 cm, subdensely to densely many flowered; floral bracts lanceolate or linear-lanceolate, 10-15 × 2-3 mm, subequal in length to ovary, apex acuminate. Flowers fragrant, white; pedicel and ovary slightly arcuate, cylindric-fusiform, 10-13 mm. Dorsal sepal erect, forming a hood with petals, ovate or elliptic, cymbiform, 4-5 × 3-3.5 mm, glabrous, 5-7-veined, apex obtuse; lateral sepals reflexed, elliptic-ovate, oblique, 5-6(-7) × 1.5-2.5(-3) mm, glabrous, 5-7-veined, apex obtuse. Petals ovate, oblique, 4-5 × 1.5-2 mm, 5-veined, apex obtuse; lip pendulous, ligulate to ligulate-lanceolate, 6-7 × 2.5-3 mm, entire, apex obtuse-rounded; spur pendulous, slightly arcuate, cylindric, 10-20 mm, exceeding ovary, slender, with a conspicuous projection near mouth. Column short; staminodes conspicuous, suborbicular; anther locules parallel; connective broad, apex subtruncate; pollinia obovoid, with long caudicles and lanceolate viscidia; rostellum erect, short; stigma lobes confluent, large, concave, lying directly below rostellum. Fl. Jun-Jul, fr. Aug. 2n = 42.
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