1. From the combined ether-soluble alkaloids of the epigeal part of Korolkowia sewerzowii Regel we have isolated a base with mp 145-147°C and the new alkaloid severine. 2. On the basis of the results of a study of its IR, NMR, and mass spectra and its conversion into the known alkaloid korseveriline, the structure of severine has been established as 3α-acetoxy-6β,14α-dihydroxy-(27α-methyl)cevanine. © 1978 Plenum Publishing Corporation.