KEY TO THE SPECIES

1	Leaves spirally arranged or subopposite; lamina scabrous above. — Widespread, in cultivation Broussonetia papyrifera
1'	Leaves distichous; lamina smooth above 2
2	Tree; margin of the lamina entire. — Philippines, Celebes Broussonetia luzonica
2'	Climber; margin of the lamina dentate. — Sumatra Broussonetia kurzii