Thirteen alkaloids have been isolated from Brazilian Cassytha americana (C. filiformis L, Lauraceae). The structures of l,2,9,10-bismethylenedioxy-3-methoxydibenzo[de,g]quinolin-7-one and 1,2,9,10-bismethylenedioxydibenzo [de,g] quinolin-7-one are suggested for the new oxoaporphine bases cassamedine and cassameridine. The plant also yielded ten previously known aporphine bases. © 1968, American Chemical Society. All rights reserved.