Bidens tenuisecta
Bidens tenuisecta , the slim lobe beggarticks, is a North American species of flowering plant in the family Asteraceae. It is native to northern Mexico and the western [United States]. There are also reports of populations in the northeastern United States but these are almost assuredly introductions.
Bidens tenuisecta is an annual herb up to 120 cm tall. It produces up to three yellow flower heads per branch, with each head containing both disc florets and ray florets. The plant grows in meadows and along mountain streams.