Differentiation of the Climatic Niches of the Invasive Oenothera l.(Subsect. Oenothera, Onagraceae) Species in the Eastern Europe

This paper is concerned with the study of differentiation of the climatic niches of the North-American Oenothera L. (Onagraceae) that are invasive to the Eastern Europe y means of the Canonical Correspondence Analysis. On the basis of the critical analysis of the herbarium material, field research performed by the authors the limits of the climatic factors restricting the species distribution were determined, the differences between specimen from different sections, certain parental and hybrid species within the climatic niches were specifie