A terrestrial herb 2–6.5 dm. high, glabrous except for the roots.. Tubers ellipsoid or elongate-ovoid, 2–4 cm. long, 1–2 cm. in diameter, tomentose.. Stem erect, slender to rather stout, with 2 unequal large leaves at the base and several smaller ones along its length.. Basal leaves adpressed to the ground, opposite, ovate to transversely elliptical, apiculate, 3–6.5 cm. long, 3.5–9 cm. broad, fleshy; stem-leaves 5–10, ± adpressed to the stem, lanceolate or ovate, acute, up to 5 cm. long.. Inflorescence 7–19 cm. long, 3.5-6 cm. in diameter, loosely to rather closely 7–21-flowered.. Bracts similar to the stem-leaves, 1.5–2.7 cm. long, mostly not so long as the pedicel with ovary.. Flowers suberect or curving outwards, green with a white centre, strongly fragrant; pedicel with ovary 2–2.5 cm. long, the latter with 6 toothed wings.. Dorsal sepal erect, broadly lanceolate, acute, very convex, 0.8–1.6 cm. long, ± 7.5 mm. broad, with 3 toothed keels on the chief veins outside; laterals deflexed, very obliquely lanceolate, acuminate, 0.9–1.8 cm. long, 4–6 mm. broad, with a central toothed keel outside.. Petals bipartite nearly to the base; posterior (upper) lobe erect, curved, linear, 0.8–1.6 cm. long, ± 1 mm. broad; anterior lobe curved upwards, horn-like, subulate-linear, 1–2.5 cm. long, a little over 1 mm. broad near the base.. Lip projecting downwards, tripartite nearly to the base; lobes linear, the middle lobe 0.9–1.9 cm. long, 1–1.5 mm. broad, the side lobes slightly shorter and narrower.. Spur ± parallel to the ovary, much swollen in the apical half, 1.4–2.3 cm. long.. Anther erect, apiculate, 3.5–6.5 mm. high, canals slightly upcurved, ± 3 mm. long.. Stigmas porrect, cylindrical, rather stout, truncate at the apex, 4–5 mm. long.. Rostellum narrowly triangular, acute, 2–5 mm. long.
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Dorsal sepal erect, 9–15 × 4–8 mm, ovate, convex, with 3 toothed keels on outside; lateral sepals deflexed, 10–16 × 2.5–6.5 mm, obliquely lanceolate, acuminate, sometimes with the apex hooked, with a central toothed keel on the outside.
Lip 3-lobed almost to base, all lobes linear, fleshy; mid-lobe 16–18.5 × 1–1.3 mm; side lobes 14.5–20 mm long, slightly narrower than mid-lobe; spur 17–23 mm long, very swollen at apex.
Petals 2-lobed ± to base; posterior lobe erect, 9–16 × 0.5–1.2 mm, linear; anterior lobe 14–25 mm long, c. 1 mm wide at base, curving up.
Basal leaves appressed to ground, the larger 4–6.5 × 4.5–9 cm, ovate to reniform, apiculate, fleshy; bract-like leaves up to 5 cm long.
Stem erect, with 2 basal leaves and 5–10 bract-like leaves scattered along its length.
Stigmatic arms 4–5 mm long, porrect, rather stout, truncate at apex, papillose below.
Pedicel 9–12 mm long, ovary 12–20 mm long with 6 toothed keels, suberect or arching.
Anther 3.5–6.5 mm high, erect, apiculate; canals c. 3 mm long, slightly upturned.
Inflorescence 7–19 × 3.5–7 cm, laxly or densely 8-to many-flowered.
Terrestrial herb 30–60 cm tall; tubers 2–4 cm long, ovoid, villous.
Flowers pale green, white in centre, fragrant.
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