Rosaceae is divided into four subfamilies, mainly on the basis of how the fruit develops:
Subfamily Rosoideae: Many small fruits, each of which is an achene[?] or drupelet, and often the fleshy part of the fruit (e.g. strawberry) is the hypanthium or the stalk bearing the carpels.
Subfamily Spiraeoideae: A non-fleshy fruit consisting of five capsules.
Subfamily Maloideae: Five capsules (called "cores") in a fleshy endocarp, surrounded by the ripened stem tissue. This structure is called a "pome". Apple, pear, hawthorn.
The rose is a rose and was always a rose; But the theory now goes That the apple's a rose, And the pear is, and so's The plum, I suppose. You, my love, are a rose, but were always a rose.
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