A terrestrial herb 2–6 dm. high, glabrous except for the roots.. Tubers ovoid or ellipsoid, 1–2 cm. long, 0.5–1.5 cm. in diameter, sparsely tomentose.. Stem erect, rather slender, the leaves mostly in the lower part.. Leaves 4–9, the 2–3 lowermost sheath-like, the middle ones almost erect, lanceolate or narrowly lanceolate, acute, the largest 6–13 cm. long, 1–2 cm. broad, the upper 1–3 spaced out along the upper half of the stem, much smaller, similar to the bracts.. Inflorescence 4–17 cm. long, 3–5 cm. in diameter, rather loosely 2–14-fiowered.. Bracts lanceolate, acuminate, 1–2.5 cm. long, distinctly shorter than the ovary with pedicel.. Flowers suberect or half-spreading, green; pedicel with ovary curved, 2–3 cm. long.. Dorsal sepal erect, elliptical or elliptical-ovate, obtuse, convex, 5–8 mm. long, ± 3 mm. broad; laterals deflexed, obliquely semi-ovate, obtuse, 6–8 mm. long, 3–4 mm. broad.. Petals bipartite nearly to the base; posterior (upper) lobe adherent to the dorsal sepal, very narrowly lanceolate or ligulate, 5–7 mm. long, 1–1.5 mm. broad; anterior lobe spreading downwards, narrowly lanceolate-ligulate, 5.5–8 mm. long, 0.5–1 mm. broad, rather fleshy.. Lip dependent, tripartite from an undivided base 3 mm. long; middle lobe ligulate, 8–12 mm. long, 1–1.5 mm. broad; side lobes about equalling the middle lobe or slightly longer, only half as broad.. Spur dependent, swollen in apical half, 2–3 cm. long.. Anther erect, ± 4 mm. high, canals incurved, ± 3 mm. long.. Stigmas pointing downwards, club-shaped, nearly 3 mm. long.. Rostellum large, placed in front of the anther, 1.5–3.5 mm. high.
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Lip 3-lobed, with a basal undivided part 1–3.5 mm long; mid-lobe 7–13 mm long, c. 1 mm wide; side lobes 7–14 × 0.5 mm, the lobes sometimes fleshy and opaque; spur 15–30 mm long, pendent, slender but slightly swollen torwards apex.
Leaves about 6, the 2 lowermost sheath-like, the uppermost 1–2 bract-like, the rest semi-erect, 6–16 × 1–2.5 cm, lanceolate or linear, acute, rather fleshy.
Petals 2-lobed ± to base; posterior lobe 5–7 × 1 mm, adnate to dorsal sepal; anterior lobe 5–8 mm long, less than 1 mm wide, spreading downwards.
Dorsal sepal 5–7.5 × 2–3 mm, ovate, erect, convex; lateral sepals 5–7 × 2.5–4 mm, falcate, spreading.
Slender terrestrial herb 30–40 cm high, with a globose tuber c. 13 mm long.
Mid-lobe of rostellum 2–3.5 mm high, standing in front of the anther.
Anther erect, 3.5–4.5 mm high; canals 2.5–3.3 mm long.
Inflorescence 8–16 × 3.5-4.5 cm, laxly 4–20-flowered.
Flowers green or yellow-green.
Stigmatic arms 2.5–3 mm long.
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