Plants 20-60 cm tall. Rootstock tuberous, fusiform, elongate, 1.5-6 × 0.4-1.5 cm. Stem erect, stout, with 1 or 2 tubular sheaths at base, 1-or 2(or 3)-leaved. Leaves cauline, alternate, usually widely spaced, elliptic, ovate-elliptic, or oblong-lanceolate, 6-15 × 2-5 cm, base clasping, apex acute or obtuse-rounded. Peduncle robust, ridged, with 2-5 foliaceous, lanceolate bracts; rachis 10-18 cm, laxly many flowered; floral bracts ovate-lanceolate, 8-20 mm, basal ones exceeding flowers, apex acuminate. Flowers yellowish green; pedicel and ovary slightly arcuate, cylindric-fusiform, 10-15 mm. Dorsal sepal erect, forming a hood with petals, broadly ovate, concave, 4-5 × 3.5-4 mm, glabrous, 3-veined, apex obtuse or acute; lateral sepals reflexed, elliptic, oblique, 5-6(-7) × 2.5-3 mm, glabrous, 3-veined, apex obtuse. Petals ovate, oblique, 4-5 × 2-2.5 mm, 2-veined, apex obtuse; lip spreading horizontally to slightly pendulous, ligulate, 5-8 × 1.5-2.5 mm, entire, apex obtuse; spur pendulous, cylindric, 11-18 mm, apex obtuse or acute. Column 3-4 mm; staminodes conspicuous; anther locules slightly divergent; connective broad, apex concave; pollinia obovoid, with slender caudicles and suborbicular viscidia; rostellum broad, short; stigma lobes confluent, concave, large, lying directly below rostellum. Fl. May-Jul. 2n = 42.
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