Annual weedy species of Erigeron in the northern Iberian Peninsula: a review

A revision of the alien Erigeron L. species formerly included in Conyza Less. found central-northern Iberian Peninsula is presented. close examination numerous specimens collected by authors as well voucher preserved at several herbaria has helped clarify aspects regarding this group. Four have been recognised study area: canadensis (=Conyza canadensis), E. bonariensis (=C. bonariensis), sumatrensis sumatrensis) and floribundus floribunda, including C. bilbaoana). They occupy anthropogenic habitats, such road edges, abandoned fields, crops waste ground, natural semi-natural communities, nitrophilous river bar communities ruderal on coastal dunes subjected to substantial levels disturbance. emerge two most frequent taxa. canadensis, regarded past widespread group, almost absent from area, especially Atlantic watershed. Furthermore, an important number previously identified do actually correspond sumatrensis. No hybrids found. detailed identification key highlighting main features that help separate four Finally, controversial group last arrive, a its expansion across western Europe century included, where it become along regions.