Distribution of Oxalis stricta L. (Oxalidaceae) on the territory of the Ulyanovsk region

The article provides data on the distribution of Oxalis stricta L. on the territory of the Ulyanovsk region. New locations have been discovered outside the growing areas in the Right-bank part of the region: in the city of Inza, the working settlements of Karsun and Bazarny Syzgan. The largest population is located in Bazarny Syzgan on a section of pine forest, where the species was first registered in 2017. Two accounting sites with an area of 1 m2 were laid, where phenological and morphological observations were carried out in the period from April to October 2023. Oxalis stricta L. on the territory of the Ulyanovsk region, in anthropogenically disturbed communities, it is able to independently maintain its numbers in the absence of more powerful competitors, but it is not an invasive species, as in the regions of Central Russia.