The other species in the genus Bidens:

Bidens biternata / Sendangusa センダングサ

Bidens biternata, an annual herb that grows to 0.3-1.5m in height, occurs in somewhat damp locations like roadsides or dry riverbeds, with stems with four ridges and curly hairs. Leaves on the upper parts are alternate, 9-15cm long, of mono- or bi-pinnate compound leaf; the leaflets are oval with pointed tips and fine serrations on the margins. Branch tips on the upper parts set 0.7-1cm-in-in diameter yellow flower heads, and involucral bracts, 3-6.5cm long, are linear with tips sharply pointed. Bloom time: September-October.