Plum

Plums are a drupe or stone fruit, meaning that they contain a pit. They are related to other common stone fruits, including apricots, peaches, nectarines, and cherries. The relation to cherries is especially close, the primary difference being that plums are larger. Plums, like other drupe fruits, are found in both clingstone and freestone varieties. Plums are far more varied than some of their relatives, however; in fact, there are so many varieties (possibly up to 2000) that sometimes even experts have trouble distinguishing among them.