New and rare hybrids of Eudicots in the flora of Kharkiv Region, Ukraine

The article contains data about interspecific hybrids of Eudicots recorded in Kharkiv Region, Ukraine. Totally, 25 hybrids of Eudicots were registered, described, and illustrated. An annotated list includes data about their distribution, ecological preferences, morphology, and information about the discovered localities. The article includes data of our own field survey, analyses of open databases on biodiversity, literature, and revision of the herbarium collections of the National Herbarium of Ukraine (KW) and V.N. Karazin Kharkiv National University (CWU). During field research, we discovered seven hybrids recorded in Ukraine for the first time (Arctium × neumanii, Centaurea diffusa × C. jacea, C. jacea × C. nigrescens subsp. pinnatifida, C. nigrescens subsp. pinnatifida × C. phrygia subsp. pseudophrygia, Corydalis × hausmanii, Rubus × areschougii, and Verbascum × thapsi) and six hybrids are new to Kharkiv Region (Arctium × cimbricum, Betula × aurata, Salix × reichardtii, Verbascum × brockmuellerii, V. × pseudolychnitis, Utricularia × neglecta). Some hybrids originated with participation of alien species or subspecies were registered (Centaurea diffusa and C. nigrescens subsp. pinnatifida). Besides, the article discusses the potential records of other hybrid Eudicots in the flora of Kharkiv Region in the future.