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Complex studies of individual systematic groups allow to carry out a modern inventory of species in certain territories, to determine the features of naturalization, adaptation of plant species, to identify ecological features of plant species under the conditions of anthropogenic transformation of intra- and extrazonal and zonal coenoses. Odesa region is a territory where natural and spontaneous fractions of flora are in constant interaction caused by human influence, as a result of which a wide range of ecotopes was formed: from man-made to natural ones. The goal is to establish a modern list of species of Euphorbia genus in the lower reaches of the Dniester–Tyligul interfluve. Literary sources, herbarium materials of the MSUD, many years of own research of the territory were used. 16 species of Euphorbia have been identified, the most widespread are species of petrophytic and steppe coenoses: E. agraria, E. sequierana, E. stepposa. And also — E. virgultosa. Relatively few references and localities are presented: E. chamaesyce, E. falcata, E. esula. Occasionally occur: E. humifusa, E. davidii, E. lucida, E. peplis, E. peplus. Ruderal species that are, however, cultivated are: E. cyparissias, E. variegata and E. lingulata. We present the last species as a ruderal plant for the first time. The only locality on the territory has E. valdevillosocarpa (sozophyte of the state level of protection, ChKU). All found species are mainly hemicryptophytes (62.50% of species of the genus in the region), heliophytes (87.50%), xeromesophytes (62.50%), representatives of meadow (25.00%) and ruderal (31.255) ecological and coenotic groups Eight belong to the synanthropic fraction of the flora, five of them are elements of the adventitious fraction of the flora. E. davidii is an invasive species. Two more species are sozophytes. For Odesa region, a number of species and forms of Euphorbia genus are listed in the MSUD herbarium collection or available literary sources. Some of the herbarium materials of the species in the historical collections of the MSUD, which we reviewed, obviously need to be redefined by specialists
Bondarenko et al. (Fri,) studied this question.