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Herbs twining, often with winged stems, peduncles, and petioles. Leaves petiolate, angular or palmate, base often cordate, margin entire. Flowers axillary, solitary or in few-flowered cymes; bracts deciduous, often foliose. Sepals often enlarged in fruit, margin becoming irregularly lacerate. Corolla broadly funnelform, rarely campanulate or nearly salverform, glabrous or midpetaline bands pubescent outside. Stamens included (exserted in 1 sp.); filaments adnate to corolla tube basally, filiform distally; anthers often spirally twisted at dehiscence; pollen 3-colpate, not spiny. Disc ringlike. Ovary 2-loculed, 4-ovuled, glabrous. Style filiform, included; stigma 2-globose. Fruit circumscissile in or above middle, distal portion lidlike, ± fleshy, separating from papery endocarp, which shatters irregularly. Seeds 4 or fewer, trigonous or globular, glabrous or angles pilose.
Lianas to small herbaceous vines, 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 becoming cori-aceous, often irregularly erose on the margins; corolla large, broadly campanulate, funnelform, or salverform, white, yellow, or reddish; stamens included, the anthers twisted at least in age, the pollen 3-colpate; ovary glabrous, bilocular, each locule bi-ovulate, the style included, filiform, the stigma biglobose. Fruits de-hiscent at or above the middle by a circumscissile epicarp, the upper part more or less fleshy and separating from the lower part and from the endocarp, 2-locular, 4-seeded; the seeds glabrous or pubescent.
Large herbaceous twiners with stems, peduncles and petioles often winged. Flowers usually large, in one-to few-flowered axillary cymes. Sepals 5, large, often enlarged in fruit. Corolla funnel-shaped or campanulate, white or yellow. Pollen smooth. Ovary 2-locular, each loculus with 2 ovules; style simple; stigma biglobular. Capsule large, the outer layer splitting around the middle, the top part or lid separating from the lower part, and the inner layer bursting irregularly. Seeds up to 4, large, pilose or glabrous, blackish.
Sepals 5, large, pergameneous to coriaceous, mostly glabrous, often ventricose, often enlarged in fruit and ultimately with an irregularly lacerate margin.
Capsule large, the outer layer splitting around the middle, the upper or lid separating from the lower part, and the inner layer bursting irregularly.
Corolla broadly funnel-shaped or campanulate, white or yellow, glabrous or with the midpetaline bands hairy outside.
Stamens 5, included, anthers large, often longitudinally twisted; pollen ellipsoid, smooth.
Ovary bilocular, each loculus 2-ovuled; style simple; stigma biglobular.
Leaves petioled; lamina entire, angular often cordate at the base.
Flowers usually large, in one to few flowered axillary cymes.
Seeds up to 4, pilose or glabrous, blackish.
Stems, peduncles and petioles often winged.
Bracts often large, caducous.
Large herbaceous twiners.
