Bidens wiebkei, a member of the Asteraceae (sunflower) family, is a perennial herb 0.5 to 1 m (1.6 to 3.3 ft) tall and woody at the base. The opposite, pinnately compound leaves are 7 to 13 cm (2.8 to 5.1 in) long and each has three to seven leaflets, 2.5 to 8 cm (1 to 3 in) long and 1 to 2.5 cm (0...