A novel azafluorene alkaloid, polylongine (5-hydroxy-6-methoxy-1-methyl-4-azafluoren-9-ol) (1) and three new aporphine N-oxide alkaloids named (+)-O-methylbulbocapnine-β -N-oxide (2), (+)-O-methylbulbocapnine -α -N-oxide (3) and (+)-N-methylnandigerine -β-N-oxide (4) were isolated from the leaves of Polyalthia longifolia (Sonn.) Thwaites (Annonaceae). © 1989.