Morphometric indicators and growing conditions of Corydalismarschalliana in the southeast of the Oka-Don lowland

The characteristics of 12 coenopopulations of Corydalis marschalliana (Pall. ex. Willd.) Pers. (Fumariaceae), growing on the border of the range in the southeast of the Oka-Don lowland in the Saratov, Volgograd and Voronezh regions (Russia), were studied. Some morphometric indicators of flowering plants in populations have been determined, and differences in indicators have been identified. C. marschalliana in the study area grows in floodplain, slope and upland oak forests and is one of the dominants of the spring ephemeroid synusia.