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The accuracy of the species and its varieties ranking was indicated by the analysis of geohistory (g) on physical (P) and chemical (c) characters. In the genus Aconitum distributed in Hokkaido and its neighboring territories, the A. sachalinense F. Schmidt group showed all the physical variations [var. (P)]. A. yesoense Nakai is the subspecies [var. (P-c)] of the above A. sachalinense based on physical and chemical considerations. A. macroyesoense Nakai was revealed as a natural mutant [var. (c)] of A. yesoense based on chemical consideration. A. itoseiyanum Miyabe et Tatew. is an independent species [var. (p-c-g)] of A. sachalinense from the geohistorical consideration joined with both selections.