Wood Sorrel Family. Comprised of 5 genera and about 570 species of annual or perennial herbs, shrubs and small trees that are primarily grown as ornamentals. Members of this family usually have flowers with five petals, ten stamens in two rings of five, a superior seed capsule with five parts, and no stipules. They often have a fleshy aril to fling the seed from the pod and often have folded leaflets.