Caucasoseris, a new genus of subtribe Chondrillinae (Asteraceae: Cichorieae) for the enigmatic Prenanthes abietina

A new genus, Caucasoseris, is established to accommodate Prenanthes abietina, a species of hitherto uncertain systematic position distributed in the western Caucasus and northeasternmost Turkey montane conifer mixed forests. Agreement has existed that belongs somewhere Crepidinae or Lactucinae but its morphological features do not match any genus previous molecular phylogenetic analyses could establish sister group. This study provides additional micro- macromorphological, palynological anatomical data, used sampling designed ascertain relationship. group relationship with Chondrillinae inferred from tree based on nrITS. In plastid DNA tree, where are resolved as clade nested inside Crepidinae, further remote rather early diverging Crepidinae. agreement also macromorphological findings, it considered an orphan lineage affinities Chondrillinae, best treated own. key genera including Caucasoseris provided. Citation: Güzel M. E., Kilian N., Sennikov A. Coşkunçelebi K., Makbul S. & Gültepe 2022: subtribe (Asteraceae: Cichorieae) for enigmatic abietina. – Willdenowia 52: 103–115. Version record first published online 16 April 2022 ahead inclusion issue.