Herbaceous or woody twiners. Leaves
petiolate, ovate to orbicular, entire or 3-5 lobed. Flowers in axillary,
sessile or short peduncled, dense cymes. Bracts small, caducous. Sepals
subequal, acute to obtuse, hairy to glabrous. Corolla yellowish-white,
urceolate, limb shortly 5-lobed with hairy midpetaline bands. Stamens included,
filaments dilated at base into a large concave scale, arched over ovary. Disc
large, annular or cupular. Ovary 2-celled, each with 2 ovules, style 1, short,
stigma 2, capitate. Fruit a capsule, 4-valved, glabrous or puberulous seeds.