Parsonsianidine, a new minor macrocyclic pyrrolizidine alkaloid having two ethyl side-chains at C-11 and C-20, was isolated along with parsonsianine from the leaves of Parsonsia laevigata. Its structure was determined by spectral analyses. 17-Methylparsonsianidine, having the same plane structure as spiranine, was also identified. © 1991.