A terrestrial herb 22-60 cm tall, growing from a very short stout rhizome. Stems solitary, slender to stout, to 55 cm long, 3-8 mm in diameter, increasingly pubescent and glandular from the base upwards, with three to four tubular sheaths at the base and two to five leaves well-spaced along its length. Leaves elliptic to broadly elliptic, acute to acuminate, 8-18 cm long, 3.5-10.5 cm wide, glabrous above and below, sparsely ciliate on the lower margins. Inflorescence one- or rarely two-flowered; peduncle 4-15 cm long, glandular especially towards the apex; bract leaf-like, elliptic to lanceolate, acuminate, 6-9 cm long, 1.5-4 cm wide, pubescent on veins of lower side, ciliate. Flower variable in size, sepals and petals green or pale green, rarely white or pale lemon-yellow, lip white spotted with pink within, staminode yellow with red spots; pedicel and ovary (2-) 3-4 cm long, densely glandular. Dorsal sepal lanceolate, acuminate, 2.8-6 cm long, 1.4-2 cm wide, pubescent at base on inner side and on outside, ciliate towards apex; synsepal narrowly elliptic, with two free acuminate tips, 3.5-5 cm long, 1-1.7 cm wide, pubescent on outside, ciliate. Petals lanceolate or linear and tapering above, acuminate, 2.8-5.5 cm long, 0.5-1.1 cm "Wide, pubescent at base within, eciIiate. Lip porrect, somewhat ellipsoidal or globose and dorsiventrally flattened, with a small mouth, 2.5-3.5 cm long; side lobes infolded and creased. Column 1-1.5 cm long; staminode oblong-trullate, obtuse, slightly longitudinally concave, . 9 mm long, 5 mm wide, glabrous.