Bidens trichosperma
Bidens trichosperma, the marsh beggar-ticks or marsh tickseed, is a North American species of flowering plant in the family Asteraceae. It is native to central Canada and to the eastern and north-central United States.
Bidens trichosperma is an annual herb up to 150 cm tall. It produces numerous yellow flower heads containing both disc florets and ray florets. The species is commonly found in marshes and along estuaries.