Bidens amplectens, a member of the sunflower family (Asteraceae), is an herb with branched stems, from 1.5 to 3 m (5 to 10 ft) tall. Sparsely pubescent leaves are pinnately compound, 9 to 15 cm (14 to 22 in) long with 3 to 5 leaflets. Diffuse compound cymes with lateral branches have 10 to 30...