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The taxonomy of    Echinochloa   , a predominantly tropical to warm-temperate genus of 40–50 species, including some of the world’s worst weeds, is still poorly understood. This is because some species, including the extremely widespread    E.   crus-galli   , show a wide range of morphological, physiological and ecological variation, in part the result of a complex recent evolutionary history. Furthermore, there is often a dearth of clear distinguishing features among species. The same applies to the species established in Southwestern Europe, where unintentionally introduced populations have now established themselves as important weeds of crops, especially maize and rice. Taxonomic and nomenclatural confusion hampers progress in weed science. In this study, we give an identification key that covers the weedy taxa encountered in Southwestern Europe, followed by notes on taxonomy and nomenclature. Moreover, a lectotype is designated for    Echinochloa   frumentacea   . It is argued that current confusion cannot be overcome without including populations of Eastern Asian origin in taxonomic studies and without the joint efforts of experts in the fields of weed science, morphology-based taxonomy, genomics and phylogenetics.

phytokeys

﻿Taxonomy of the weed species of the genus    Echinochloa    (  Poaceae  ,   Paniceae  ) in Southwestern Europe: Exploring the confused current state of affairs

﻿Taxonomy of the weed species of the genus Echinochloa ( Poaceae , Paniceae ) in Southwestern Europe: Exploring the confused current state of affairs

Taxonomy of the weed species of the genus Echinochloa ( Poaceae , Paniceae ) in Southwestern Europe: Exploring the confused current state of affairs