Features of morphogenesis of Astragalus (Fabaceae) of the temperate region of the Old World

The evolution of life forms, as a vector of development from arboreal ancestors to grasses, is very problematic for species of genus Astragalus. Different trends prevail in different sections of this large genus. In the subgenus Astragalus. The range of life forms is typologically more diverse than in Cercidothrix. The degree of lignification of axial shoots in species of the subgenus Cercidothrix is becoming a trend of adaptive specialization towards increasing climate aridization.