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Herbs twining or prostrate. Leaves petiolate, base usually cordate, margin entire, angular, or lobed. Inflorescences axillary, 1-to few-flowered cymes; bracts 2, leaflike, borne well below calyx, persistent. Sepals 5, apex acute; outer 3 ovate, slightly enlarged in fruit; inner 2 much smaller. Corolla campanulate or funnelform; limb shallowly 5-lobed. Stamens included; filaments dilated basally, adnate to corolla tube, free distally, filiform; pollen not spiny. Disc ringlike. Pistil included; ovary 1-loculed or imperfectly 2-loculed apically, 4-ovuled. Style 1, filiform; stigmas 2, ovate-oblong, complanate. Capsule globose, 4-valved, pilose. Seeds 4 or fewer.
A twining or prostrate perennial herb. Leaves usually cordate at the base. Flowers on axillary peduncles in 1–several-flowered bracteate cymes. Sepals herbaceous, acute; the 3 outer ones large, ovate, accrescent in fruit; inner ones smaller. Ovary hairy, 1-locular or imperfectly 2-locular, 4-ovuled. Style simple, filiform; stigmas 2, ovate-oblong, complanate. Capsule 1-locular, usually 4-valved.
Flowers on axillary peduncles in 1-several-flowered bracteate cymes; bracteoles oblong or linear-lanceolate, acuminate, positioned at some distance from the calyx.
Ovary hairy, unilocular or imperfectly bilocular at the apex, 4-ovuled; style simple, included; stigma 2, ovate-oblong, campanulate.
Sepals 5, herbaceous, the outer ones large, accrescent in fruit, inner ones smaller.
Stamens 5, included; filaments linear with dilated base; pollen smooth.
Capsule locular, usually 4-valved, 4-or, by abortion, less-seeded.
Corolla medium-sized, campanulate to funnel-shaped, heptangular.
Twining or prostrate perennial herb.
Seeds black, glabrous, opaque.
Disk annular.
