1	"Leaves 2-3 times pinnatisect; ray florets yellow, the limb 6-20 mm long"	"Bidens schimperi"
1	"Leaves usually pinnately 3-9-lobed; ray florets white, absent or, if yellow, the limb 3-6 mm long"	2
2	"Ray florets, if present, yellow; fruits heads 10-25 mm tall; outer phyllaries linear-lanceolate to oblanceolate"	"Bidens biternata"
2	"Ray florets, if present, white; fruiting heas up to 12 mm tall; outer phyllaries spathualte"	"Bidens pilosa"