A Nomenclatural and Taxonomic Revision of the Senecio squalidus Group (Asteraceae)

Senecio squalidus (Asteraceae) currently includes nine subspecies distributed in North and Central Europe and in the Mediterranean basin. Within this taxonomic aggregate, many species have been described, but research on their nomenclatural types is incomplete. A complete nomenclatural survey of 19 names belonging to this taxonomically critical group was carried out. Fourteen lectotypes are here designated. The nomenclatural analysis, complemented by field investigations in the type localities of the taxa described in the Central Mediterranean, allowed us to accept 10 species. Accordingly, we proposed here a new name and a new missing combination at a specific level: S. aknoulensis and S. calabrus.

Automated summary

Senecio squalidus, a plant species of the Asteraceae family, consists of nine subspecies. A comprehensive study was conducted to examine the nomenclatural types of this taxonomic group, resulting in the designation of 14 lectotypes. Field investigations and nomenclatural analysis led to the acceptance of 10 species and the proposal of two new names.