New distribution data on Altai endemic Ranunculus schischkinii in floras of Russia and Kazakhstan

As a result of revision of herbarium specimens of buttercups and data analysis of collected samples and field observations, the new data on distribution of the endemic plant of Altai Ranunculus schischkinii (Ranunculaceae Juss.) have been revealed. From the positions of the administrative boundaries, R. schischkinii, previously known from several habitats only within the Russian sector of the Altai Mountains, is now a new species for the flora of Kazakhstan. Information on all known locations of this species is given for the first time. Specific features of the environmental confinement of the species, original herbarium voucher labels indicating a place of storage, including new data, as well as the taxonomic position of the species and a reference to its original description are provided