Alangium lamarckii Thw. (Alangiaceae), an Indian medicinal plant, has already been shown to be the only source of ipecacuanha alkaloids outside the family Rubiaceae. Several other bases with simple benzoquinolizidine skeleton or its hybrid with di- or tetrahydroisoquinolines or tetrahydro-β-carbolines besides a glycosidic base and N-benzoyl-L-phenylalaninol have since been isolated from this plant. We reported earlier the isolation of emetine, cephaeline, psychotrine and alangamide from the seeds. The present communication deals with the isolation from the same part (seeds) of three more alkaloids, viz. venoterpine (compound A), dl-salsoline (compound B) and isocephaeline (compound C), hitherto not found in this genus, and their characterization. Deoxytubulosine, previously reported from the fruits of this plant, has also been encountered in the seeds. Venoterpine represents the first reported occurrence in this genus of the rare monoterpene alkaloid, so far encountered only in Apocyanaceae species. dl-Salsoline is the only simple isoquinoline base reported so far from this plant. Isocephaeline, although known synthetically for a long time, is reported here for the first time as a natural product.