Plants 30-47 cm tall. Rootstock creeping, cylindric, stoloniferous. Stem erect or ascending, with 2 tubular sheaths at base, 2-leaved. Leaves cauline, widely spaced, elliptic, narrowly elliptic, or narrowly oblong, 9-15 × 1.5-5 cm, base contracted and clasping, apex subobtuse or subacute. Peduncle slender, with 1 or 2 foliaceous, lanceolate bracts; rachis cylindric, 6.5-12 cm, laxly many flowered; floral bracts narrowly lanceolate, margin ciliate, apex long acuminate. Flowers fragrant, yellowish green; pedicel and ovary cylindric-fusiform, 5-6 mm. Dorsal sepal erect, connivent with petals, ovate-oblong, ca. 4 × 1.8 mm, 3-veined, apical margin ciliate, apex obtuse; lateral sepals spreading, linear-lanceolate, oblique, ca. 4.5 × 1.2 mm, 3-veined, apical margin ciliate, apex obtuse. Petals triangular-ovate, oblique, ca. 5 × 2 mm, 1-or rarely 2-veined, apex obtuse; lip strongly deflexed, ligulate-linear, ca. 6 × 1.5 mm, entire, apex obtuse; spur pendulous, cylindric, 17-18 mm, exceeding ovary, slender, tapering slightly toward apex, apex obtuse. Column ca. 1.5 mm, stout; staminodes small; anther locules nearly parallel; pollinia obovoid, with short caudicles and elliptic viscidia; rostellum erect, short; stigma lobes separate, raised, clavate, protruding. Fl. Jul-Aug.
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