Bidens.

Botanical name: 
Bidens bipinnata

BIDENS, L. Spanish Needles. Bad weeds in fields. Leaves small like carrot, they die wool of a fulvous color. Equivalent of Daucus and Acmella.

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