Mitrella kentii (Bl.) Miq. of the family Annonaceae is a tree-climbing liana, found in the oak-forests of New Guinea. The alkaloidal constituents of this species have not previously been examined though field tests indicated their presence in the bark. Thin-layer chromatograms of the crude alkaloid mixture (yield: 0.063% of dry weight) resembled those originating from Scheffleroomita subaequalis, another New Guinean liana of the same plant family. In fact all four alkaloids isolated were also present in S. subaequalis. The three main constituents were identified as liriodenine, anonaine, and asimilobine by direct comparison with authentic specimens. The fourth, minor, alkaloid was shown to be identical with aequaline.