During the floristic survey of certain sections of the Kirensky, Kazachinsko-Lensky and Ust-Kutsky districts of the Irkutsk region in 2016–2018, 79 species of vascular plants were identified, new or rare for the Prilensko-Katangsky (PR) floristic district in three areas: Lena- Angara plateau (PV-11), Cisbaikalian depression (PV-12) and Prilenskoe plateau (PS-14). For PR in general, 6 species were found for the first time, for PV-11 and PV-12 – one species each, for PS-14 – 30 species. It also provides information about the new locations of 9 plant species included in the red book of the Irkutsk region.

Bayanov Evgeniy Sergeevich, Tyumen State University, 3, Pirogov st., Tyumen, 625043, Russian Federation, e-mail: bes6262@inbox.ru

Stepantsova Nadezhda Vasilyevna, Candidate of Sciences (Biology), Leading Engineer, Irkutsk State University, 1, Karl Marx st., Irkutsk, 664003, Russian Federation, e-mail: nadia@irk.ru

Khozyainova Natalia Vladimirovna, Candidate of Sciences (Biology), Direktor of Herbarium Tyumen State University, 3, Pirogov st., Tyumen, 625043, Russian Federation e-mail: hozainovanv@mail.ru

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