Plants 20-40 cm tall. Rootstock tuberous, narrowly fusiform to cylindric, elongate, 3.5-5 × 0.3-0.6 cm. Stem slender, with a tubular sheath at base, 1-leaved. Leaf oblong-elliptic, 5-11 × 0.8-2 cm, base clasping, apex obtuse. Peduncle slender, with 2 or 3 foliaceous, ovate-lanceolate bracts; rachis 6-12 cm, sparsely many flowered; floral bracts narrowly lanceolate, 12-15 mm, basal ones exceeding ovary. Flowers yellowish green; pedicel and ovary cylindric, 9-12 mm, slender. Dorsal sepal erect, forming a hood with petals, broadly ovate, cymbiform, 2.5-3 × 2-2.5 mm, glabrous, 3-veined, apex obtuse; lateral sepals reflexed, narrowly elliptic, 3-3.5 × 1.2-1.3 mm, glabrous, 3-veined, apex obtuse. Petals erect, ovate to narrowly ovate, oblique, 2.5-3 × 1-1.5 mm, slightly fleshy, 1-veined, apex obtuse; lip spreading horizontally to pendulous, broadly linear, 5-6 × 1.2-1.5 mm, entire, apex obtuse; spur slightly pendulous, sometimes incurved, cylindric, 12-17 mm, slender, apex obtuse. Column ca. 1.5 mm; anther locules nearly parallel; connective slightly concave; pollinia obovoid, with short caudicles and suborbicular viscidia; rostellum rather small; stigma lobes confluent, concave, lying directly below rostellum. Fl. May-Jul. 2n = 42.
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