A terrestrial herb 2.5–5.5 dm. high, glabrous except for the roots.. Tubers ellipsoid or elongate-ovoid, 2.5–5 cm. long, 1.5–2 cm. in diameter, tomentose.. Stem erect, slender to rather stout, with 2 large leaves at the base and several much smaller ones along its length.. Basal leaves adpressed to the ground, broadly ovate to reniform-orbicular, rounded or obtuse at apex, sometimes somewhat cordate at base, 5–11 cm. long, 5–16 cm. broad, rather fleshy; cauline leaves 5–7, lanceolate, acuminate, up to 3 cm. long.. Inflorescence 8–22 cm. long, 4.5–6.5 cm. in diameter, rather closely many-flowered.. Bracts lanceolate, acuminate, 10–18 mm. long, thin in texture, shorter than the pedicel with ovary.. Flowers spreading or half-spreading, white to greenish-cream; pedicel with ovary often slightly curved, 2–2.5 cm. long.. Dorsal sepal erect, elliptical-lanceolate, acute, very convex, 9–12 mm. long, 4–6 mm. broad; laterals deflexed or refiexed, obliquely semi-ovate, acuminate, 10–14 mm. long, 4–5.5 mm. broad.. Petals bipartite nearly to the base; posterior (upper) lobe erect, curved-lanceolate, acute, 9–12 mm. long, 1–2 mm. broad; anterior lobe projecting forwards or curving upwards, filiform, 2–3 cm. long, 0.5–1 mm. broad towards the base.. Lip projecting forwards, tripartite nearly to the base; middle lobe linear, 8–15 mm. long, ± 1 mm. broad; side lobes narrowly linear to filiform, 2–2.5 cm. long, a little narrower than the middle lobe.. Spur incurved in the middle to form a complete loop, narrowly cylindrical, a little swollen in the apical part, ± 3.5 cm. long.. Anther erect, apiculate, ± 6 mm. high, canals upcurved in the apical half, nearly 4 mm. long.. Stigmas porrect, club-shaped and truncate at the apex, slender near the base, ± 6 mm. long.. Rostellum narrowly triangular, acute, nearly 4 mm. long.
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