Bidens heterodoxa

Bidens heterodoxa, the Connecticut beggarticks, is a North American species of flowering plant in the daisy family. It is native to eastern Canada (Québec, New Brunswick, Prince Edward Island) and the northeastern United States (Connecticut).
"Bidens heterodoxa" is an annual herb up to 50 cm (20 inches) tall. It produces as many as 3 flower heads containing yellow disc florets but usually no ray florets (occasionally 1, 2, or 3). The species grows mostly along the banks of estuaries and coastal salt marshes.