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Data on distribution of 3 rare species which occur in sandy arrays of cross-border territories of Southern Siberia and Mongolia are provided: Iris psammocola, Iris loczyi (Iridaceae) and Vicia tsydenii (Fabaceae), a brief characteristic of their cenopopulation is given.The originality of the plant communities which occur in sandy arrays allows a number of authors to distinguish them as special florocenotype-psammophyton (Psammophyton) [1]. The structure of vegetative cover of sandy arrays considerably depends on the relief and degree of the substrate coherence [2]. In the south of the Tuva Republic in the reserved area "Ubsu-Nur Depression" the cluster of "Tsuger-Els" was investigated. It represents a sandy mane extended from the northwest to the southeast along the left riverbank of the Tes-Hem. To the northwest of mane there is big fresh lake Tore-Hol. Within the cluster a wavy undulating land prevails. The total area of Tsuger-Els sands covers about 60 km². Similar arrays proceed also in the territory of Mongolia -the Altan-Els sands entering the largest array Borig-Del. The cluster belongs to Ubsunursky plain desert-steppe province [3]. In 2005 in the territory of Tsuge-Els cluster a new species for the flora of Russia -Iris psammocola Y.T. Zhao was found [4]. The species has obconical rhizome, flowers on short peduncles which are inside the curtain is characteristic of this species, is on 2 pedicel lanceolate webbed spata are available for each flower, the perianth tube is thin funnelshaped, many times exceeds the ovary at length, the flowers are sulfur-yellow. In 2013 in the neighborhood of lake Tore-Hol we also found this species: "Republic of Tuva, Erzinsky district, lake Tore-Hol neighborhood, Tsuger-Els sands, N 50˚09.231 'E 95˚12.751', H=1200 m, 6.06.2013. The plants occur in different plant aggregations of small structure and the rarefied herbage, at the same time the projective covering makes about 20% in cenopopulation: Thymus mongolicus (Ronn.) Ronn. -sp., Carex sabulosa Turcz. ex Kunth -sol., Agropyron desertorum (Fisch. ex Link) Schult.sp., Thesium tuvense Krasnob. -sol., I. psammocola -sol.; in some about 30%: Alissum lenense Adams -sol., Th. mongolicus -sol., Artemisia sp. -sol., Oxytropis tragacanthoides * Corresponding author: norbo@ngs.ru

The results of the study of the species composition dynamics in successive plant communities developing on the northern slopes of the coal mining spoils dating back to the 70s, 80s, 90s and 2000s years in the arid areas of Khakassia, are presented for the first time. During the first 10-15 years of revegetation there was an increase in taxonomic diversity in the successive plant assemblages. Endemic species of the Fabaceae family, common for the bunch grasses steppes and stony steppes of Khakassia, were not found on the northern spoil slopes. Mesoxerophytes were the most abundant ecological group. Drastic increase in the complexity of the successive plant assemblages in the arid areas of Khakassia was found to take place after 25-30 years of revegetation.

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