T. hissoricus Lipsky. The sample was obtained on the R. Obi'Khengau, TadzhSSR (8 June 1966) in the fruitbearing stage. Two hundred grams of the leaves was exhaustively extracted with methanol. After suitable working up, 6.1 g of chloroform alkaloids and 9.31 g of reduced alkaloids (7.73% of the weight of the dry plant) were obtained. From the combined chloroform alkaloids (6.7 g) were isolated 5.14 g of the N-oxide of viridiflorine [2] and 0.2 g of trachelanthine [8], and from the reduced alkaloids (9.37 g) was obtained 4.8 g of viridiflorine [4] and 2.24 g of trachelanthamine [8]. The presence of the same bases was detected in the mother liquor by paper chromatography.