Annual weedy species of Erigeron in the northern Iberian Peninsulaa review

  1. Liendo, Diego 1
  2. García-Mijangos, Itziar 1
  3. Biurrun, Idoia 1
  4. Campos, Juan Antonio 1
  1. 1 University of the Basque Country (UPV/EHU). Department of Plant Biology and Ecology.
Revista:
Mediterranean Botany

ISSN: 2603-9109

Año de publicación: 2021

Volumen: 42

Tipo: Artículo

DOI: 10.5209/MBOT.67649 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Mediterranean Botany

Resumen

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

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