A large and important family, widely distributed and including some of our loveliest flowers and most delicious fruits; herbs, shrubs, or trees; generally with stipules and usually with alternate leaves; the flowers rich in pollen and honey and usually perfect. The calyx usually five-lobed, often with bracts, with a disk adhering to its base; the petals of the same number as the calyx-lobes, separate or none; the stamens usually numerous, separate, with small anthers; the ovary superior, or partly inferior; the pistils few or many, separate or adhering to the calyx, sometimes, as in the true Rose, enclosed and concealed in a hollow receptacle; the fruit of various kinds and shapes.

There are several kinds of Opulaster, branching shrubs, with clusters of white flowers and grayish or reddish, shreddy bark.