Anethum feniculum.

Botanical name: 

ANETHUM FENICULUM, L. Fennel. Cultivated and often spontaneous. Seeds pungent, aromatic, equivalent to anniseeds, but a different flavor. The sweet fennel is bleached and eaten like cellery in Italy.

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