A perennial twiner with very large, ovoid or elongated, tuberous roots and long,twining, tough, glabrous and shining stems; leaves simple, alternate. 8-15cm long,broader than long, deeply palmately cut into 5 or 7 lanceolate-acuminate, obtuse lobes,glabrous, paler and with prominent veins beneath; petioles nearly as long as the leaves,glabrous, channelled above; flowers regular, bisexual, bright mauve-purple, large onglabrous pedicels, 1,5cm long, in dichotomous cymes, peduncle 6cm long and stout,exceeding the petiole; sepals 5, imbricate, 9mm long, 8-10mm broad, rotundalc,obtuse, very concave and glabrous; petals 5, fused into a funnel-shaped corolla. 6-7,5cm diameter, lobes cmarginate. convolute and contorted in' bud; stamens 5,filaments almost equal inserted on the corolla-tube, hairy at the base; ovary superior,2-4 locular, glabrous, style simple, stigmas 2, globose; capsule 1,2cm long, ovoid,closely surrounded by enlarged, rather fleshy sepals; seeds covered with very long,brownish, cottony hair which is readily detached. Flowers during April, May andSeptember. (Sri Lanka)