Figure 1.

Phylogenetic tree of Magnoliophyta: (a) families growing in the western Caspian Sea cost in Dagestan and Kalmykia (purple—families that were found in both ‘early’ and ‘late’ sites, green—families that were found only in the ‘early’ site). (b) vegetation of the key sites (black—species that were found in both key sites, blue—species that were found only in the ‘early’ site, red—species that were found only in the ‘late’ site). Branch lengths are measured in millions of years.