High Quality Content by WIKIPEDIA articles! Bidens is a genus of flowering plants in the family Asteraceae. It contains about 200 species. The common names beggarticks, black jack, bur-marigolds, stickseeds, tickseeds and tickseed sunflowers refer to the achene burrs on the seeds of this genus, most of which are barbed. The generic name refers to the same fact; it means "two-tooth", from Latin bis "two" + dens "tooth".