Bidens micrantha subsp. ctenophylla is an erect perennial herb, 0.5 to 1.5 m (1.6 to 5 ft) tall, and slightly woody at the base. The leaves are simple or occasionally trifoliate (a compound leaf with three leaflets), 6 to 9 cm (2.4 to 7.5 in) long with one to nine leaflets that are egg- and lanced-...