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

By

Hoste, Ivan
Verloove, Filip

Type

Article

Date of Publication

2022

Original Publication

PhytoKeys

Volume

197

Pages

1--31

Subjects

Echinochloa , evolutionary history , lectotypification , Nomenclature , Poaceae , Southwestern Europe , taxonomy

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers [2010]-

Identifiers

DOI: https://doi.org/10.3897/phytokeys.197.79499

 

Abstract

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.