Rumex stenophyllus Ledeb. (Polygonaceae Juss.) in the middle Siberia.

During research of the flora of Krasnoyarsk city there was found Rumex stenophyllus Ledeb. which belongs to the standard section and subsection of Rumex genus whose specimens alongside with entire inner folioles of perianth have leaflets with short teeth not passing into setaceous endings. This species is shown in "Flora of the USSR" and "Flora of Eastern Europe" for regions which include the territory of Krasnoyarsk kray, but, as well as indications of Siberian authors, it has no confirmation with herbarium samples.R. stenophyllus is an Eurasian species, in natural (solonetzic and marshy) phytocenosis it is found in steppe and forest-steppe zones of European Russia and Western Siberia, and also in the Far East. Natural habitats are specified also for southern Buryatiya which is quite regular as all points of gathering in this region are located on the edge of central Asian part of the area overstepping Siberia from Mongolian Dauria where the species dwells in the native communities on solonetzic coastal meadows and pebbles.At the same time R. stenophyllus is a ruderal plant. It was obviously gathered as an alien plant repeatedly in different areas of Middle Siberia: in Tuva by G.P. Miklashevskaya (1915, the Herbarium of Krasnoyarsk regional museum of local lore); in the outskirts of Krasnoyarsk by N.V. Stepanov (1990-1991, the Herbarium of Siberian Federal University, KRSU), and also possibly in the Western Sayan Mountains by N.M. Martyanov. The particular species was found out by us near a filling station in 63a Bryanskaya St, Krasnoyarsk, on June 12, 2011. The number of population (36 individuals) and the presence of last year's sprouts with well kept fruits (10 individuals) are the evidence of its naturalization. The supervision over the population during the vegetative period has shown significant reduction of its members number (up to 11 individuals).According to classification of adventitious plants by F.-G. Schroider (1969), R. stenophyllus nowadays on the territory of Krasnoyarsk can be attributed according to the way of drift to xenophytes, and according to the degree of naturalization to colonophytes (naturalized plants). The obvious tendency to expansion of the area of habitation of the species in a place of drift is limited by anthropogenic influence. The collected samples of R. stenophyllus are kept in L.M. Cherepnin Herbarium of V.P. Astafyev Krasnoyarsk State Pedagogical University. Duplicates are passed to Komarov Botanical Institute, Tomsk State University and to the Krasnoyarsk regional museum of local lore.

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