Frangula

About

Frangula is a genus of about 56 species of flowering shrubs or small trees, commonly known as buckthorn, in the buckthorn family Rhamnaceae. The common name buckthorn is also used to describe species of the closely related genus Rhamnus in the same family, and also the superficially similar but only distantly related sea-buckthorn, Hippophae rhamnoides in the Elaeagnaceae.

Summary from Wikipedia