Bidens lemmonii
Bidens lemmonii is a North American species of flowering plant in the family Asteraceae. It is native to the southwestern United States and Mexico.
Bidens lemmonii is an annual herb up to 30 cm tall. It produces flower heads sometimes one at a time, sometimes in a group of several, each containing yellow disc florets and white ray florets. The species grows in wet seeps on rocky mountainsides.
The species is named for John Gill Lemmon, husband of American botanist Sara Plummer Lemmon.