Prostrate, sprawling to twining herbs, perennial. Leaves often sagittate or hastate with rounded, angular or lobed bases, mostly glabrous. Flowers axillary, solitary or few-flowered cymes. Bracts 2, large, ovate to elliptic, enveloping the calyx, persistent. Sepals 5, subequal, ovate to oblong, herbaceous. Corolla white or pink, campanulate or infundibuliform. Stamens 5, epipetalous. Ovary 1-celled with 4 ovules, style 1, stigmas 2, oblong or elliptic, complanate. Fruit capsular, ovoid to globose. Seeds smooth or verrucose, black.