The Rose family (in Latin rosaceae) got his name from the largest genera among included in this group the “rosa” (rose).
Rosaceae can be trees, shrubs as well as herbaceous plants. Mostly perennials, but some annuals also are included.
Rose family has regular flowers with 5 sepals and 5 petals and numerous stamens. The flowers have a minimum of 5 stamens but often many more, usually in multiples of five. In most cases you can recognize the Rose family based solely on the sepals, petals and stamens. Domestic roses have much more petals that were bred from the stamens.
Another useful pattern of the Rose family is that many (not all) of the plants have oval, serrated leaves or leaflets.
Many flowers of the Rose family have several to numerous simple pistils (apocarpous), or they may be united at the base, with the styles still separate, to make a single compound pistil (syncarpous) with numerous styles. Members of the Plum subfamily have a single simple pistil (unicarpellate).
There are many varieties of fruits were once considered the main characters for the definition of subfamilies. They can be follicles, capsules, nuts, achenes, drupes (Prunus) and accessory fruits, like the pome of an apple, or the hip of a rose. Many fruits of the family are edible.
There some examples of fruits with the main characteristics:
The strawberry is really the swollen receptacle beneath the pistils
The raspberry is swollen ovary of each simple pistil combined to create an aggregate fruit
The rose hip is formed from the swollen receptacle where the flower parts are attached
The apples are the swollen ovaries
Several economically important products come from this family, including many edible fruits (such as apples, apricots, plums, cherries, peaches, pears, raspberries, and strawberries), almonds, and ornamental trees and shrubs (such as roses, meadowsweets, photinias, firethorns, rowans, and hawthorns).
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