A large, glabrous twiner. Stems terete, the adult parts woody, lenticellate. Leaves orbicular in outline, 5-20 by 5-20 cm, deeply palmately lobed to beyond the middle or to the base into 3-5 segments; middle segment mostly much larger than the lateral ones, ovate, elliptic or elliptic-oblong, mostly attenuate towards both ends, acuminate at the apex with acute or obtusish, mucronulate point; lateral segments ovate-lanceolate to linear-lanceolate; margins of segments slightly crisped, entire or coarsely dentate to crenate; petiole shorter than the blade, 2½-13 cm. Inflorescences axillary, 8-30 cm long, few-to several-flowered; peduncle 1½-14 cm, widely cymosely branched. Pedicels as long as or longer than the sepals, 8-15 mm. Sepals subequal or the outer ones slightly shorter, elliptic or ovate-elliptic, obtuse, concave, 7-10 mm long, green at the base, for the rest red-purple or purplish black. Corolla red or red-purple, salver-shaped, the tube slightly angular, somewhat narrowed to the base, ca 4 cm long, ca 1 cm diam.; limb ca 4-4½ cm diam., 5-lobed with rounded lobes. Stamens and style exserted; filaments pale purple, densely villous at the base; style white, stigma dark purple, ovary glabrous.
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