A new C-19-diterpenoid alkaloid designated as delelatine has been isolated from Delphinium elatum L. and D. tatsienense Franch. and its structure has been elucidated by spectroanalytical methods. Delelatine has been correlated with 14-acetyl-10-deoxydictyocarpine and synthesized from dictyocarpine, thus confirming its structure and stereochemistry. © 1988.