1. From the combined alkaloids of the epigeal part of Korolkowia sewertsovii Rgl. collected at Saryagach we have isolated sevkorine, korseveriline, korseveridine, korseverinine, a base with mp 212-214°C, and the new alkaloid severtizidine. 2. On the basis of a study of the chemical and physical characteristics of the alkaloids itself and the products of its transformations, the most probable structure and configuration of severtzidine has been established as 3β,6β,14α-trihydroxycevanine. © 1977 Plenum Publishing Corporation.