Callicarpa americana.

Botanical name: 

CALLICARPA AMERICANA, L. Sowerbush. Virginia to Florida. Ornamental shrub, the purple berries die wool purple with alum; they are edible, acid, sweetish and subastringent. Leaves useful for dropsies in decoction, according to Dale, Miller, Schoepf, and Elliott.

Medical Flora, or Manual of the Medical Botany of the United States of North America, Vol. 2, 1830, was written by C. S. Rafinesque.