Annual or biennial, slender, villous, climbing herb, sparingly prickly; leaves ovate to cordate, palmately 3-5 lobed, lobes oblong-lanceolate, coarsely serrate, tomentose on both surfaces, apex acute, margins serrate; stipules very small, setaceous; peduncles solitary, axillary, pedicels shorter than petiole, jointed in the middle; bracteoles 8-12, linear, free, shorter than calyx; sepals 5, lanceolate, 3-5 nerved, connate below the middle; corolla yellow with a purple centre, 2-3 times longer than sepals; anthers regularly arranged along the whole length of staminal tube; ovary 5-celled, each with 3 or more ovules, style slender, stigmas-5, capitate; capsule 5-valved, winged at the edges, hairy, shorter than calyx; seeds tubercled.