We have investigated the total bases and the known alkaloids (korseveriline, sevedine, sevcorine) in various organs of the plant Korolkowia sewerzowii Rgl. (gathered in 1984 at Saryagach, near Tashkent) according to the vegetation periods. Comminuted air-dry samples of the plant were moistened with 10% ammonia and extracted with chloroform; the alkaloids were re-extracted from the chloroform extract with 5% sulfuric acid, the acid solution was made alkaline with ammonia, and the alkaloids were extracted with chloroform. The largest amount of the combined alkaloids in the stems and leaves was observed in the early vegetation period, and the smallest amount in the seed-ripening stage; with the growth of the plant, the total amount of bases in the bulbs decreased. Korseveriline, sevedine, and sevcorine were detected in various organs of the plant, with the amount of korseveriline and sevedine higher than that of sevcorine in all the organs; sevcorine was detected in the seeds only in trace amounts.