Abstract
The region was divided into 33 elementary floristic areas for a cluster analysis by the W ard 's method. These areas were adopted in modelling of convergent (or agglomerative) floristic divisions: the static and florogenetic. The static division was based on species similarity measured by the index of S okal & S neath (1963 : formula 5). In the dendrogram, the region is divided into the S Boreal, Hemiboreal and Central Asiatic subregions, comprising the provinces: Baikal, Dauria-E Mongolia, NW Mongolia, W Mongolia, and S Mongolia. The florogenetic division, basing on genus/species spectra, includes five provinces: Baikal, Patom, Dauria-Mongolian, Middle Mongolia, and S Mongolia. The evolutionary trends in the floristic genesis of different areas was revealed in retrospect by the indices of taxonomic originality (Malyshev 1991). Presumably, the generic originality was related to the genesis of floras mainly in the Neogene, and the species originality was due to the floristic genesis in the Pleistocene.
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