Shrubs or herbs, with milky latex. Leaves opposite or whorled; axils of leaves without bristles. Inflorescences erect, umbellate; flowers all opening ± simultaneously. Corolla with short tube, 5-lobed. Corona of 5 lobes, arising from near base of staminal column, flat with lateral margins folded forwards to form a cavity. Anthers 2-locular, appendaged. Follicles usually 1. Seeds with tuft of hairs.