This article summarizes information on the natural and synanthropic distribution of the arcto-alpine species Sedum annuum (Crassulaceae) within Ukraine, its ecological and biological characteristics, and descriptions of its synanthropic habitats. In the Ukrainian Carpathians, S. annuum has been recorded in 16 localities within its natural range. Given the relatively low number of known occurrences, the species qualifies as regionally rare. Recently, several secondary occurrences of S. annuum were discovered in Zhytomyr Region, within the Uzh River basin, in the natural region of Zhytomyr Polissia. The secondary habitats of S. annuum are confined to roadsides along asphalted roads, cracks in concrete slabs, and granite outcrops along the Uzh River. The studied secondary habitats of S. annuum are associated with plant communities from three syntaxa: pioneer rock communities of the alliance Sedo albi-Veronicion dillenii within the class Sedo-Scleranthetea, ruderal roadside communities of the alliance Eragrostion within the class Digitario sanguinalis-Eragrostietea minoris, and the alliance Sisymbrion officinalis within the class Sisymbrietea. The species grows in xerophytic conditions under full illumination, on substrates with a wide range of soil acidity — from acidic to ultrabasic, is undemanding to soil fertility. As an alien element of the flora, it is classified as a neophyte, ergasiophygophyte, and colonophyte. The probable pathway of S. annuum’s introduction into the flora of Polissia is its former cultivation as an ornamental plant.

Keywords: alien species, biodiversity, Carpathians, distribution, flora, naturalization, populations, Zhytomyr Region

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