Abstract
From 2016 to 2018 a comprehensive mapping of hawkweeds (Hieracium s. str., Pilosella and Chlorocrepis) accompanied by intensive activities in collecting of herbarium specimens was carried out in the Burgenland (Austria). Additionally, records cited in literature and obtained by revision work in several European herbaria were added to our database. As a result, an annnotated list of hawkweeds species in Burgenland country is presented. It is based on almost 2900 datasets, of which nearly 2700 are documented by herbarium specimens. In additition to Chlorocrepis staticifolia the list includes 22 species of the genus Hieracium with 64 subspecies and 32 species of the genus Pilosella with five subspecies. All of them are documented by herbarium specimens. In addition, 31 subspecies from literature are cited in the text. Eight species of the genus Hieracium (H. diaphanoides, H. glaucinum, H. neostenophyllum, H. pillii, H. pseudobifidum, H. rotundatum, H. sibaricum, H. transylvanicum) and eight species of the genus Pilosella (P. acrothyrsa, P. calodon, P. erythrochrista,P. flagellaris, P. heterodoxa, P. koernickeana, P. tubulata and P. ziziana) were detected for the first time in Burgenland. Seven species, mentioned in the botanical literature (H. clusii, H. saxatile, H. schmidtii, H. subramosum, P. dubia, P. onegensis, Schlagintweitia intybacea) are classified as wrong or dubious information. The name of H. brevifolium subsp. brachysteleon is validated, the name of H. pilosellinum subsp. purbachense is lectotypified. Six new combinations are made: H. rotundatum subsp. lancifolium, H. rotundatum subsp. leptocephaloides, H. rotundatum subsp. platyrhombum, H. rotundatum subsp. pleiophyllopsis, H. rotundatum subsp. praecurrens, H. rotundatum subsp. subserratifolium.