Though placed by most botanists in the same genus, each of the stone-fruits constitutes a natural group so distinct that neither botanist nor fruit-grower could possibly take one for another as the trees and fruits of the different groups are called to mind. But there are outstanding forms which seem to establish connections between the many species and the several groups of fruits and through these outliers the characters are so confounded in attempting to separate species that it becomes quickly apparent that there are few distinct lines of cleavage within the genus. For several centuries systematists have disputed as to whether the stone-fruits fall most naturally into one, two, or three genera--indeed have not been able to agree as to whether some species are plums or cherries, or others apricots or plums. Hybridization between the cultivated divisions of the genus--unquestionably it has taken place in nature as well--has added to the perplexities of classification. Accepting, then, for the present at least, the very artificial classification which, rather paradoxically, places in one genus a number of fruits commonly thought of as quite distinct, let us briefly note the characters which best distinguish cherries from their congeners. The cherry is nearest of kin to the plum. These two are roughly separated from the other cultivated members of the genus to which they belong by bearing their fruits on stems in fascicles while the others are practically stemless and are solitary or borne in pairs. The fruits of plums and cherries are globular or oblong, succulent and smooth or nearly so. Peaches, apricots, nectarines and almonds are more sulcate than plums and cherries and the almond has a drier flesh, splitting at maturity to liberate the stone; and, with the exception of nectarines and a few varieties of apricots, all are very pubescent. The stones of cherries and plums are smooth, or nearly so, while those of the other fruits are sculptured and pitted, though those of the apricot are often somewhat plum-like. Cherries are separated from plums by their smaller size and distinctive color of skin, juice and flesh; by the texture and distinct flavor of the flesh; by growth in corymbose rather than umbelliferous fascicles; by the more globular stone; and by the arrangement of the leaves in the bud. Leaves of the plum are usually convolute, or rolled up, in the bud, while those of the cherry are conduplicate, or folded lengthwise along the midrib.