This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
Herbs, shrubs, or trees, erect, prostrate, or rarely climbing. Leaves alternate or rarely opposite, simple or variously compound, stipulate. Calyx superior or inferior, with 5 or 4 lobes, the fifth lobe next the axis. Petals 5, rarely none, inserted under the margin of the disk, imbricate. Stamens usually numerous, seldom 1 or few, inserted with the petals. Disk lining the calyx-tube. Fruit various. Seeds ascending or pendulous, exalbuminous. With the tribe Chrysobalanea, this order numbers 71 genera and about 1,000 species, occurring in all parts of the globe. This is one of the most important groups of plants, furnishing numerous useful species, such as the Apple, Pear, Plum, Cherry, Strawberry, and Raspberry, besides many of the most ornamental shrubs and herbaceous plants of our gardens.