Orenburg region

FEATURES OF THE POPULATION ORGANIZATION OF THE RARE SPECIES CEPHALARIA URALENSIS (MURR.) SCHRAD. ex ROEM. ET SCHULT (DIPSACACEAE, MAGNOLIÓPSIDA) IN THE TRANS-VOLGA AND CIS-URALS REGIONS

The results of our study of 23 natural cenopopulations of Cephalaria uralensis (Murr.) Schrad. ex Roem. et Schult., a rare subendemic species of the Eastern European steppe zone, in the Trans-Volga and Cis-Urals regions (in the territory of Bashkortostan Republic, the Samara and Orenburg regions) are presented. Density indices, features of the age structure and demographic indices were studied and compared. The total density varies from 2.2 to 10.3 ind./m2. The averaged ontogenetic spectrum of C. uralensis is centered.