Twiners, stellately hairy or glabrous. Leaves
petiolate, various shapes, entire, rarely dentate or lobed. Flowers umbelliform
or capitate cymes, often terminal spikes or in scorpioid cymes. Bracts small,
linear to lanceolate or foliaceous. Sepals equal or subequal. Corolla
funnel-shaped or campanulate, blue, lilac or pink, rarely white with 5 distinct
midpetaline bands, limb entire, 5-lobed. Stamens included, filiform, Ovary
bilocular, style 1, stigmas 2, elliptic or oblong, complanate or globose. Fruit
capsule, globose, 4 or 8-valved. Seeds smooth or minutely papillose.