Variability of the morphological sings of Atraphaxis frutescens (L.) C. Koch

Morphological variability of Atraphaxis frutescens (L.) C. Koch. in four natural population from Central and Western Siberia is investigated. Plants from the Omsk cenopopulations different from the others by the qualitative and the quantitative signs. An increase practically all metric signs found in the Novosibirsk cenopopulations, that is caused by habitat conditions. The greatest morphological similarity found in the plants from more southern populations of the Republic Tyva and Altai Krai. An increase of the individual variability of the signs in these populations is noted, in comparison to populations from Novosibirsk and Omsk regions. This fact point to the xerophytic nature of A. frutescens and its ecological optimum in a zone of steppes. The most informative signs for establishment of the structure of the species and its populations are allocated: length and width of the leaves, top and lower corners of the leaf blade, length and width of the inflorescence, length and width of the fruit, length and width of the petal of perianth at the fruits.