The ontogenetic and vitality structures of four populations of Pseudolysimachion viscosulum (Klokov) Tzvelev (Veronica viscosula Klokov) have been investigated. All populations are characterized as normal, incomplete, with prevalence of generative plants, and with different vitality spectra. It is noted that the share of generative plants depends on the general projective coverage in phytocenoses.

Keywords: Pseudolysimachion viscosulum, population, ontogenetic structure, vitality spectrum

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