Erect, decumbent or scandent terrestrial herbs, 100-750 mm tall; tubers 1-8, spreading, elongate-oblong, tomentose. Stem robust, 95-740 x 3.5-11.0 mm. Leaves 5-13, lax to dense, cauline, lower sheathing, blades reduced, oblong-lanceolate to widely-ovate, acute to acuminate, margins entire, smooth to undulate, 19-178x9-40 mm. Inflorescence cylindrical, 74-191 x 67-132 mm, lax to dense, 3-20-flowered; bracts similar to upper leaves, sheathing, ovate-lanceolate to ovate-oblong, acuminate to apiculate, 16.5-43.5x6.0-17.0 mm. Flowers spreading, green and white, pedicel and ovary sub-erect, 30-59 mm long. Dorsal sepal green, sub-erect to erect, elliptical-ovate, galeate, acute to acuminate, 12.5-18.5 x 4-7 mm; lateral sepals green, patent, slightly deflexed, oblong-lanceolate to oblong-ovate, acute to apiculate, base oblique, margins weakly to strongly revolute with acute tooth on lower margin, 10.0-20.5x4-8 mm, adnate to lip and stigmatic processes for 4.0-6.5 mm. Petals upper lobe green, erect, narrowly-falcate, acute to acuminate, 9.5-18.0 x 1-4 mm, adnate to dorsal sepal, lower lobe white with green tip, spreading horizontally, weakly deflexed, weakly to strongly falcate, linear to linear-lanceolate, tip curved, acuminate, 11.0-24(-27.5) x 0.5-2.0(-2.5) mm, adnate to claw of lip for 1.5-4.0 mm. Lip green, claw 6.5-12.0 mm, median lobe descending, geniculate, sometimes apically recurved, linear-lanceolate to narrowly-oblong, acute to acuminate, 7-27 x 1-3 mm, lateral lobes descending, diverging, falcate, linear-lanceolate, tips curved, acuminate, 10.5-32.0x0.5-3.0 mm; spur toothed, 27-51 mm long, clavate apex 7.0-14.5 mm long. Anther erect, acute, 4.5-7.0 mm long, canals slender, 6.5-11.0 mm long. Stigmatic processes spathulate, projecting forwards and deflexed, sub-parallel, 8.5-15.0 mm long, base adnate to lip. Rostellum 3-lobed, base auriculate, median lobe cucullate, acute to acuminate, margin ciliate, 5-9 mm long, lateral lobes linear, fused to anther canals, projecting forwards to sub-erect 20°, sub-parallel, 2.0-3.5 mm long.
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