Bidens cernua is a species of flowering plant in the aster family, Asteraceae.

[4][5][6][7] Bidens cernua is distributed throughout much of Eurasia and North America.

[9] Bidens cernua is distributed throughout much of Eurasia and North America.

[4][5][6][7] Bidens cernua is an annual species growing roughly 1m tall, with a fibrous root.

Stem leaves are simple, unstalked, and opposite.