American Plum - Prunus americana
American Plum bears thorny spur twigs and can be shrublike or a small tree. It is most distinguished from other thorn-bearing plums by the long leaves (five inches) which are pointed with double-toothed margins. The flowers are up to an inch in width and foul smelling. The red fruits are also an inch wide. The bark can break into strips as the trees mature. This species occupies a variety of habitats and grows to high elevations. It is wide-ranging, from eastern Montana across the Midwest to the Atlantic coast. This native is used as grafting stock for domestic plums.