Genus Alchemilla L., Rosaceae in the floras of Nizhny Novgorod region and Republic of Mari El

Based on a critical revision of materials in NNSU, YOLA, MW, LE, I.L. Mininzon’s herbarium, own authors’ collections, a checklist of the genus Alchemilla for the Nizhny Novgorod Region and Republic of Mari El was compiled. The checklist includes Russian and Latin names of species, common synonyms, brief nomenclature quotes, the data on occurrence, preferred habitats, species distribution in regions by administrative districts and botanical-geographical areas. As a result of the study, 55 Alchemilla-species in the flora of Nizhny Novgorod Region, and 51 ones in the flora of Mari El were registered. For both regions, 28 species are noted for the first time. Six species - A. czamsinensis, A. glaucescens, A. hians, A. hebescens, A. nemoralis, A. samuelssonii (A. obtusa auct.) - were indicated for the flora of the Republic erroneously. The species richness for regional floras in the forest parts of studied area (49-51 species) is similar and clearly exceeds the number of species in its forest-steppe part (42), and each one of them exceeds that for the more southern forest-steppe regions. In studied territory, the most prominent is a role of the Volga Upland for existence of a number of forest-steppe species associated with it (A. decalvans, A. exilis, A. hebescens, A. hians, A. nemoralis, A. ventiana). Sharp borders of changes in occurrence (i.e., boundaries of the «abundance zone») for endemic and local endemic species (A. substrigosa, A. abramovii, A. gibberulosa, A. glyphodonta, A. nemoralis, A. vorotnikovii, A. zimoenkensis, A. dasycrater, A. prasina, A. pustynensis) are noted.