Taxonomical value of inflorescence scent in Hieracium s. str.

► Neighbour joining analysis of inflorescence scent data in Hieracium s. str. ► A NJ-tree based on scent reflects distinct morphological and phenological groups. ► The scent grouping is congruent with genetic groupings. ► Reticulation analyses reflect the hybrid status of intermediate taxa. ► The data point towards a hybrid status of putative non-hybid taxa.