Rhizome conical, 2.5-3.5 x 2-2 .5 cm. pale yellow in the centre, whitish towards the periphery; roots fieshy, root tubers many, ovoid, 3-5 x 2-2.5 cm, white inside, non-aromatic. Leafy shoot 30-60 cm tall. Pseudo stem 8-10 cm long. Leaves distichous, 3-5, petiolate; petiole 20-25 cm long; lamina 15-30 x 7-12 cm, elliptic, base oblique, tip acuminate, minutely hairy along the prominent side veins on the upper side, lower side glabrous; ligule 2 mm long, hyaline. Inflorescence both lateral and central; peduncle 10-15 cm long; spike 12-15 x 4- 5 cm with a distinct, violet coma. Coma bracts large, 4-4.5 x 1.5 cm, tip rounded, fused only about lower 114, dense violet, outer surface minutely hairy. Fertile bracts 3.5-4 x 1.5 cm, tip slightly acute, not recurved, pale green with a purple patch at the tip, lower 1/3 fused, each subtends 3-4 flowers . Bracteoles small, outer 1.5 x 0.6 cm, inner 4 x 2 mm, linear, purple, minutely pubescent. Flowers c. 4 cm long, equal to the bracts. Calyx tubular, 1-1.2 cm long, shortly and inegularly 3-lobed at apex, white, tube minutely, pubescent. Corolla tube c. 2.5 cm long, deep purple, pubescent; lobes unequal , dorsal lobe c. 1.5 x 1 cm, apiculate, lateral lobes c. 1 x 0.5 cm, ovate-lanceolate, deep purple, glabrous. Labellum obovate, obscurely 3-lobed, tip emarginate, purple or with a median bright yellow band. Lateral staminodes oblong, 1.5 x 0.5-0 .7 cm, deep purple, glabrous. Anther 4 mm long, thecae parallel, white with a pink base, spurs bent inwards; filament purple. Epigynous glands two, 5 mm long, linear. Ovary c. 4 x 3 mm, trilocular, with many ovules on axile placenta, densely pubescent, hairs directed upwards. Style long, filiform , pink; stigma bilobed. Fruit globose to ovoid, with persistent calyx, 1-1.2 x 0.9 cm, brown, hairy. Seeds many, 3 x 2 mm, brown, aril white, lacerate.