"P.H.Raven, 1964" . _:b76393849 . . _:b76393849 . . "Ludwigia sect. Africana P.H.Raven, 1964" . "Ludwigia sect. Africana" . . "50157166" . _:b76393849 "TROPICOS id" . . _:b76393849 "50157166" . "Ludwigia sect. Africana" . . "921158" . "Ludwigia sect. Africana" . . _:b76393849 . . .