The genus Trollius (Ranunculaceae) in the Russian Far East

The critical revision of Trollius L. (Ranunculaceae) in the Far East of Russia was made, in which nine species were recognized. The identification key and taxonomical synopsis of the genus have been provided. Synonymy, geographical distribution and coeno-ecological peculiarities of each species of these nine species are presented. For the first time Trollius japonicus Miq. was found in the territory of Russia (the Kurile Islands: Iturup, Kunashir). Furthermore, we found that the information on the distribution of this species on Sakhalin Island is wrong owing to the incorrect identification. The information about the medical use of each of nine Trollius species is also provided.