Инвентаризация ястребинок и ястребиночек (Hieracium, Pilosella, Asteraceae) в Байкальской Сибири

We present an account of genera Hieracium and Pilosella (Asteraceae) in Baikal Siberia (Irkutsk Oblast’, Republic of Buryatia and Zabaikalskii Krai). We critically checked the Herbarium IRKU (Irkutsk). For the review we used also data from LE, NSK, TK and IRK, as well as selected publications of different authors. Finally, in the Baikal Siberia we revealed 25 species of Hieracium and 11 species of Pilosella . Five species for the whole re gion ( H. filifolium Uksip, H. schischkinii Uksip, H. tuvinicum Krasnob. et Schaulo, P. glomerata (Froel.) Arv.-Touv., P. sulfurea (Doll) F. W. Schultz et Sch. Bip.), three species for Republic of Buryatia ( H. irkutense Tupitz., H. subfariniramum (Ganesch. et Zahn) Uksip ex Tupitz., P. caespitosa (Dumort.) P. D. Sell et C. West.) and two species for Zabaikalskii Krai ( H. fariniramum (Ganesch. et Zahn) Uksip ex Sennikov, H. irkutense Tupitz.) we have found for the first time. Main diversity of Hieracium is limited by Irkutsk Oblast’ and Baikal rift zone, while the most of Pilosella , being adventive plants for the region, occur mostly along the foothills of the Khamar-Daban Ridge, where their area is coincides with refugium of nemoral (broadleaved) flora. We emphasize the modern role of the refugium for naturalization of alien plant species in the region.