Aconitum napellus.

Botanical name: 

ACONITUM NAPELLUS, L. Wolfsbane. Schoepf says that it grows in Virginia, no one else has seen it; he must have mistaken for it the A. uncinatum, our only native species, which grows from Virginia to Missouri, and has probably similar qualities. The Wolfsbane is an acrid nauseous poison, but diuretic, drastic, pellent, sudorific, errhine, vesicatory, &c. Producing vertigo and convulsions. It is, however, used in Europe in minute doses, as a heroic remedy in schirrus, anchylosis, spina ventosa, amaurosis, gout, rheumatism, and even intermittent fevers.

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