Shrubs with unlobed leaves, mostly cordate based and attenuate apices. Margins are entire, except for a group of Andean species which are serrate. Epicalyx absent. Calyx is small (less than half the length of the mature fruit), and without costae. Corollas are mostly yellow. The stamens are terminal on a short, included staminal column, which is filamentiferous at its apex. The ovary is of 3-6 carpels, with 5 being most common. Fruit a schizocarp with distinctive mericarps which are bulbous – apiculate. They are smooth-walled, with two seeds in the upper bulbous, dehiscent portion, and a solitary seed below in the lower constricted, indehiscent portion. Variations on this can extend to a one seeded form. Fruits minutely glandular-puberulent to nearly glabrous.