Large to small herbaceous climbers, the stems, petioles and pedicels often winged. Leaves entire to lobed, often cordate. Flowers axillary, in few-flowered cymes or solitary. Sepals large, glabrous, enlarging in fruit and becomings coriaceous, often irregularly erose on the margins. Corolla broadly campanulate, funnel-shaped or salverform, white, yellow or reddish. Anthers twisted in age. Fruits dehiscent at or above middle by a circumscissile epicarp, the upper part more or less fleshy and separating from the lower part and from the endocarp, 2-locular. Seeds glabrous or pubescent.