Plants slender to robust, 14-45 cm tall. Tuber palmately 2-or 3-lobed. Stem erect, with 2 or 3 tubular sheaths at base, 3-5-leaved. Leaves usually widely spaced and alternate, green, not spotted, narrowly obovate-oblong or elliptic to elliptic-lanceolate, 5-12 × 1.5-5 cm, apex obtuse or acute, uppermost leaf often smaller and bractlike. Rachis 3-15 cm, ± laxly to densely many flowered; floral bracts linear to narrowly lanceolate, 2-3 cm, lower ones exceeding flowers. Flowers greenish yellow to greenish brown, small; ovary and pedicel ca. 10 mm. Dorsal sepal erect, concave, ovate-elliptic, 4.2-8 × 2.5-3.5 mm, 3-veined, apex obtuse; lateral sepals oblique, ovate-elliptic, slightly longer than dorsal sepal, 4 or 5-veined, apex obtuse. Petals straight, forming a hood with dorsal sepal, linear-lanceolate, 5-6 × 1-1.2 mm, 1-veined; lip deflexed, oblong-lanceolate, 5-9 × 3-4 mm, fleshy, disk with a short, central, longitudinal keel, 3-toothed toward apex; lateral teeth 1.5-2 mm; mid-tooth smaller, less than 1 mm; spur saccate-ovoid, 2-4 mm. Fl. Jun-Aug. 2n = 40, 41, 42.
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