Plants slender to somewhat robust, 15-50(-65) cm tall. Tubers subglobose to oblong-ovoid, 0.8-2 × 0.6-1.5 cm. Stem with 2 or 3 tubular sheaths at base, 4-6-leaved. Leaves widely spaced along stem, ovate, oblong, or oblong-lanceolate, 2.5-10 × 0.6-2.5 cm, apex acute or acuminate. Inflorescence 11-38(-47) cm; peduncle cylindric to slightly ridged, slender to stout; sterile bracts several, ovate-lanceolate, to 3.5 cm; rachis 4-24 cm, laxly to subdensely many flowered; floral bracts ovate-lanceolate, 5-15 mm, basal ones often exceeding ovary, apex acuminate. Flowers erect to horizontal, yellowish green or pale green to whitish; ovary 6-10 mm including pedicel. Dorsal sepal forming a hood to erect, narrowly oblong-ovate, concave, 3-4 × 0.8-1.2 mm, 1-veined, apex obtuse; lateral sepals spreading, oblong-lanceolate, oblique, 3-4 × 0.8-1 mm, 1-veined, apex obtuse. Petals connivent with dorsal sepal and forming a hood, narrowly ovate-oblong, ca. 3 × 0.8-1 mm, 1-veined, apex obtuse; lip narrowly oblong-ovate, ca. 4.5 × 0.8 mm, divided near base by a transverse ridge into a short, concave hypochile and a longer, deflexed, deeply 3-lobed epichile, ecallose; lateral lobes spreading at right angles to axis of lip, linear, 4-7 mm; mid-lobe oblong-lanceolate, ca. 2.5 mm, apex obtuse; spur pendulous, cylindric-clavate, 3-4 mm, apex sometimes shallowly 2-lobed. Column ca. 1.5 mm; viscidia ellipsoid; rostellum with short arms. Fl. May-Oct. 2n = 25 ± 2, 42 + 0-2B, 44, 46, 48, 50.
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