Population status and variation of the rare species Dactylorhiza viridis (L.) R. M. Bateman, Pridgeon &amp; M. W. Chase (Orchidaceae) under anthropogenic load conditions in the meadow phytocenoses of the Central Caucasus
Izvestiâ Saratovskogo universiteta. Novaâ seriâ. Seriâ Himiâ. Biologiâ. Èkologiâ