Six alkaloids have been isolated from the leaves of Glycosmis bilocularis, 5 of which are known compounds viz. arborine, arborinine, glycorine, kokusaginine and skimmianine, all previously isolated from other species of Glycosmis. The sixth alkaloid was identified as 1,5-dihydroxy-2,3-dimethoxy-10-methyl-9-acridone (5-hydroxy-arborinine). © 1978.