Memoranda Soc. Fauna Flora Fennica 93: 1–78. 2017 ISSN 0373-6873 (print) Helsinki 13 June 2017 ISSN 1796-9816 (online) A phylogenetic checklist of Sorbus s.l. (Rosaceae) in Europe Alexander N. Sennikov* & Arto Kurtto Sennikov, A., Botanical Museum, Finnish Museum of Natural History, P. O. Box 7, FI–00014 University of Helsinki, Finland. Komarov Botanical Institute of Russian Academy of Sciences, Prof. Popov Str. 2, RU–197376 St Petersburg, Russia.*e-mail:
[email protected] (author for correspondence). Kurtto, A., Botanical Museum, Finnish Museum of Natural History, P. O. Box 7, FI–00014 University of Helsinki, Finland. A new checklist of Sorbus s.l. in Europe provides an updated classification of this group accord- ing to the latest phylogenetic studies. In order to achieve monophyly, five non-hybrid genera are accepted which represent separate evolutionary lineages (Aria, Chamaemespilus, Cormus, Sorbus s. str., Torminalis), with five hybridogenous genera described here (Borkhausenia = Aria × Sorbus × Torminalis, Hedlundia = Aria × Sorbus, Karpatiosorbus = Aria × Torminalis, Majovskya = Aria × Chamaemespilus, Normeyera = Aria × Chamaemespilus × Sorbus). The checklist includes 201 taxa accepted at the species level: 5 diploid species, 5 diploid hybrids, 186 apomictic species, and 5 apomictic hybrids. Numerous new binomial combinations are proposed to reflect the phyloge- netic position of accepted taxa. The synonymy and nomenclature are revised, and lectotypes are designated for ten plant names. In addition, a new nothogeneric name, Sorbomeles, is proposed for hybrids between Sorbus and Micromeles. Additional key words: apomictic taxa, hybridogenous taxa, hybrids, Mountain-ash, new names, nomenclature, phylogeny, Rowans, Service Tree, synonymy, taxonomy, typification, Whitebeams Introduction & Dickinson 1990; Vamosi & Dickinson 2006).