The alkaloid composition of four far-eastern species of Thalictrum - Th. amurense, Th. contortum, Th. filamentosum, and Th. minus - have been studied, for the first time in the case of the first three species. Th. amurense contains β-allocryptopine and thalictrisine, and Th. contortum contains β-allocryptopine. Glaucine and thalicsimidine have been found in Th. filamentosum, and argemonine has been isolated from Th. minus for the first time. © 1977 Plenum Publishing Corporation.