Onion of genus Allium L. in the flora of Ganzurinsky ridge: the analysis of diversity of ecological and geographic features (Western Zabaikalye)

In the flora of the Ganzurinsky ridge 10 species of the genus Allium are found, relating to 7 sections and subgenus. The majority of onions are of subgenus Rhiziridium (50%). The onions of xerophilous ecology prevail (5 of 10 genera). Allium anisopodium и A. senescens are the most characteristic of them in the mountaneous steppes of the ridge. According to areological features the Eastern Asian steppe and mountaneous steppe species dominate that points at dominating influence of the Dauria-Manchurian center along with the South-Mongolian on the formation of the modern flora of the the Ganzurinsky ridge. The Altai onion refers to the rare species, it has been noticed only in one habitat - on the remained stony slope of the Selenga.