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Plants robust, up to 1 m tall; leaves cauline, 6-10, linear-lanceolate, acute, to 280 x 20 mm. Inflorescences lax, many-flowered; bracts clasping the pedicel, lanceolate, acuminate, 10-20 mm long; pedicel with ovary angled, pedicel horizontal, c. 15 mm long, ovary deflexed, c. 10 mm long. Flowers green with white centre, unpleasantly scented. Median sepal reflexed, concave, elliptic, obtuse, 6-8 mm long; lateral sepals deflexed and twisted, obovate with lateral apiculus, 9-11 mm long. Petals deeply bipartite, puberulous; upper lobe reflexed, linear, 5-8 10-20 mm long; pedicel with ovary straight or curved, pedicel 10-15 mm long, ovary c. 15 mm long. Flowers green with white centre. Median sepal reflexed, concave, elliptic, obtuse, 5-6 mm long; lateral sepals obovate with lateral apiculus, 8-9 mm long. Petals deeply bipartite; upper lobe recurved, linear, puberulous, c. 5 mm long; lower lobe elliptic-oblong or narrowly oblong, usually obtuse, puberulous basally, 8-9 mm long. Lip deeply tripartite, deflexed; midlobe linear, 10-11 mm long; side lobes linear-lanceolate, c. 7 mm long; spur straight, twisted through 180°, inflated in the apical half, 15-20 mm long. Anther reªflexed, c. 2 mm tall, canals divergent then incurªved, puberulous basally on the inside, c. 3.5 mm long; stigmatic processes clavate, divergent, pu-berulous, c. 4 mm long; central rostellum lobe subulate, c. 2 mm long.
Lip deflexed, 3-lobed to 1.5–2 mm from base; mid-lobe 13–17 mm long; side lobes 10–16 mm long; all lobes linear, 0.5–1 mm wide; spur 10–16 mm long, spirally twisted in middle, inflated at apex, pendent or slightly incurved.
Pedicel and ovary 20–40 mm long, the pedicel straight, the ovary bent down at approximately right angles to the pedicel, and about half its length; pedicel and ovary becoming straight and suberect in fruit.
Terrestrial herb, up to 0.7 m high. Inflorescence lax, flowers numerous. Anterior petal lobe spreading downwards, both petal lobes ciliate. Spur 11-22 mm long. Flowers green.
Petals 2-lobed almost to base, both lobes ciliate; upper lobe curving back, 5–8 × 1 mm, linear; lower lobe deflexed, hinged, 14–18.5 × 2 mm, narrowly lanceolate, acute.
Stem leafy; leaves 5–10, the basal 1–2 sheath-like; the next few semi-erect, the largest 7–28 × 1–2(3.7) cm, narrowly lanceolate; upper leaves becoming bract-like.
Dorsal sepal reflexed, 6–8 × 2.5–4 mm, elliptic; lateral sepals 9–11 × 5–8 mm, obliquely obovate with a lateral apiculum.
Inflorescence 6–35 × 5.5–10 cm, fairly laxly several-to many-flowered; bracts 10–20(30) mm long.
Stigmatic arms porrect, 5–7 mm long, slender but enlarged and truncate at apex.
Flowers green, white in centre, with an unpleasant smell.
Anther 3 mm high; canals porrect, 5–6 mm long.
Tubers 1–4 × 1–2 cm, ellipsoid or ovoid.
Robust terrestrial herb to 1 m high.
Rostellum mid-lobe 1–2 mm long.
