is a medium-sized family with 85 US species, in ten genera. Plants are annual or perennial herbs producing one to many stems, usually hairless, with simple leaves, opposite or alternate. Leaves are often thick and succulent-like. The inflorescence is produced at the tip of the stems and often at the upper leaf nodes; either a single flower or clusters of various shapes. Flowers generally have two sepals, not fused, and a variable number (2 to 19) of petals, free or fused. The number of stamens ranges from one to many, the styles from one to eight. Anthers are pink or yellow.