Plants stout, 0.5-1.2 m tall; leaves cauline, many, suberect, lanceolate or linear-lanceolate, acute, to 350 x 20 mm. Inflorescences dense, many-flowered; bracts lanceolate, acuminate, denticulate, papery, 10-30 mm long; pedicel with ovary curved, pedicel 10-30 mm long, ovary 15-30 mm long. Flowers green. Median sepal reflexed, concave, elliptic, obtuse, 5-7.5 mm long; lateral sepals deflexed, obcordate with lateral apiculus, 8-10.5 mm long. Petals deeply bipartite; upper lobe recurved, linear, puberulous, 5.5-8 mm long; lower lobe elongate lanceolate, acute, puberulous at least at the base, 9.5-13.5 x c. 2 mm. Lip deeply tripartite; midlobe linear, obtuse, 11-15 mm long; side lobes linear-lanceolate, acute, 10-12.5 mm long; spur gently incurved, twisted through 180°, distinctly inflated in the apical half, 20-30 mm long. Anther reflexed, 2.5-4 mm tall, canals incurved, 3.5-6.5 mm long; stigmatic processes porrect, clavate, glabrous or puberulous, 4.5-6 mm long; central rostellum lobe linear-triangular, c. 3 mm long.
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