Euphorbia davidii subils (Euphorbiaceae) - a new species for the Central Black Soil region (Russia)

It is reported that Euphorbia davidii Subils - a new species noted in the flora of the Central Black Soil Region was found in the Belgorod Oblast (Russia). The total area occupied by the population of this species was more than 300 m2. The data on the main diagnostic differences between close species E. davidii and E . dentata Michx. are indicated and information on the findings of this alien plant in Europe and in Russia. Most populations of E. davidii have a small number of plants, but in some cases, groups of plants can occupy large area. The species noted mainly on railways and agricultural lands without introduce into natural habitats.