Bearded Beggarticks (Bidens aristosa (Michx.) Britton)

Also known as Ozark tickseed sunflower; also classified as Bidens aristosa var. retrorsa.

Both USDA PLANTS and BONAP both lump long-bracted tickseed sunflower (Bidens polylepis) in with this species, without recognizing any varieties or subspecies. Most other authorities, including POWO, Go Botany, FSUS, separate them, and we follow this other scheme, separating the two. Some authorities have treated these taxa as different varieties of one species, under this name.