ALLIONIA, in botany, a genus of the monogynia order, belonging to the tetrandria class of plants; and in the natural method ranking under the 48th order, Aggregata. The characters are: The common salix is oblong, simple, three-flowered, five-parted, and persistent; the proper one, obscure, above: The proper corolla is monopetalous and funnel-shaped; the mouth quinquefid and erect: The stamina consist of four bristly filaments, longer than the corolla, and bending to one side; the antheræ are roundish: The pistillum has an oblong germen beneath; the stylus is bristly, and longer than the stamina; the stigmata are multiid and linear: There is no pericarpium: The seeds are solitary, oblong, and naked: The receptaculum is naked. There are two species, the violeacea and incarnata, both natives of America.