Home – Home – Jornals – Contemporary Problems of Ecology 2014 number 5

The study concerned 24.6 % (844 species and sub-species) of flowering plants of Magnoliopsida in Siberia. Seven forms of sexual differentiation were found among these species: gynomonoecy (268 species, 7.8 %), gynodioecy (219 species, 6.4 %), dioecy (157 species, 4.6 %), monoecy (124 species, 3,6 %), andromonoecy (67 species, 1.9 %), trioecy (5 species, 0.1 %), and androdioecy (4 species, 0.1 %). Fifteen out of ninety-four dicot families only had species with unisexual flowers: Amaranthaceae, Betulaceae, Euphorbiaceae, Salicaceae, Urticaceae etc. We found an association between sexual expression among dicot plants and life forms, the types of areas, environmental groups in the degree of hydration and lap-zonal groups. It was shown that the incidence of irregular non-hermaphroditic plants in different ecological and biological groups and floristic provinces of Siberia directly depended on the frequency of occurrence of these species in the endemic areas.