Erect, decumbent or scandent terrestrial herbs, 100-640 mm tall; tubers 1-8, spreading, elongate-oblong, tomentose. Stem slender, 95-630 x 1.5-5.0 mm. Leaves sometimes withered at flowering, 5-13, lax, cauline, lower leaves intermediately basal, sheathing, narrowly-obovate to oblanceolate, acute to acuminate, margins entire, rarely undulate, 20-250 x 4-19 mm. Inflorescence cylindrical, 40-212 x 34-64(-80) mm, lax to dense, 3-35-flowered; bracts sometimes withered at flowering, similar to upper leaves, sheathing, linear-oblong to ovate-lanceolate, apiculate, 10-25 x 2.5-7.5 mm. Flowers spreading, green and white, pedicel and ovary sub-erect to erect, 14-32 mm long. Dorsal sepal green, sub-erect to erect, elliptical-oblong, galeate, acute to acuminate, 7.0-13.5 x 3-5 mm; lateral sepals green, patent, strongly deflexed, oblong-lanceolate to ovate, acute to apiculate, base oblique, margins weakly to strongly revolute with small acute tooth on lower margin, 7.0-15.5 x 2.0-6.5 mm, adnate to lip and stigmatic processes for 3-6 mm. Petals upper lobe green or white, erect, linear, acute to acuminate, 6-14 x 0.5-2.0 mm, adnate to dorsal sepal, lower lobe white, spreading horizontally, weakly to strongly deflexed, falcate, lanceolate to widely-obovate, tip curved, acute to apiculate, 8.5-15.0(-19.0) x (1.5-)3.0-8.0 mm, adnate to claw of lip for 1-5 mm. Lip claw 3-9 mm, median lobe green or white, descending, weakly to strongly geniculate, filiform to linear, acute, 5.5-17.0 x 0.5-2.0 mm, lateral lobes white, descending, diverging, falcate, narrowly to broadly-oblanceolate, tips curved, apiculate, 6.5-21.0 x (1.5)2.0-6.5 mm; spur toothed, curved, 12-26 mm long, clavate apex 8-17 mm long. Anther erect, acute, 2.5-5.5 mm long, canals slender, 3.5-5.5(-9.5) mm long. Stigmatic processes clavate, projecting forwards and deflexed, weakly divergent, 3.5 7.0(-10.5) mm long, base adnate to lip. Rostellum 3-lobed, base auriculate, median lobe narrowly-cucullate, apiculate, margin ciliate, 3.0-5.5 mm long, lateral lobes linear, fused to anther canals, sub-erect to 45°, sub-parallel, 0.5-2.0(-6.5) mm long.
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Terrestrial herb, slender, geophyte, up to 0.5 m high; with oblong, tuberous roots. Leaves cauline, linear-lanceolate, attenuate, up to 170 x 12 mm. Inflorescence a lax, elongated raceme; flowers 3-21, white and green. Sepals unequal; median sepal erect, forming hood, 7-12 mm long; lateral sepals oblique and reflexed. Petals deeply 2-lobed, upper lobe narrowly linear, 8-11 mm long, lower (anterior) lobe oblanceolate, acute, 11-18 mm long, fused at base with stigmatic arms and lip. Lip 3-lobed, midlobe linear, 7-11 mm long, side lobes oblanceolate, acute, slightly longer than midlobe; spur 11-14 mm long. Flowering time Aug.-Oct.
Tuberous geophyte to 50 cm. Leaves scattered, linear-lanceolate. Flowers few to many in a lax raceme, green and white, to 40 mm long, petals bilobed, lip 3-fid, spur 11-25 mm long, stigmas ± 6 mm long.
Petals 2-lobed; upper (posterior) lobe 10–20 mm long, linear, adnate to dorsal sepal; lower (anterior) lobe 9.5–15 × 3.5–6.5 mm, obovate or semi-orbicular from a narrow base, spreading.
Leaves 10–12, sometimes starting to wither at flowering time, particularly towards the base of the plant, 10–40 × 1–3 cm, linear-lanceolate, acute, slightly falcate.
Inflorescence 5–20 cm long, several-to many-flowered; ovary and pedicel 1.8–3.2 cm long, semi-erect; bracts 2–3 cm long, ovate, acuminate.
Sepals 8.5–11 × 3.5–8 mm; dorsal sepal erect, ovate, acute, very convex; lateral sepals obliquely ovate, acute, ± rolled lengthwise.
Lip 1.6–2 cm long, 3-lobed, with claw c. 8 mm long. Mid-lobe 7–10 × 0.5–0.8 mm, linear; side lobes similar to lower petal lobes.
Column 4–6 mm long; stigmatic arms 7–9 mm long; anther canals 4–5 mm long.
Flowers green, the lower petal lobes and lip lateral lobes white.
Slender plant 25–50 cm tall.
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