Abstract
WILKIN, P., 1992. The status of Amaranthus bouchonii Thellung within Amaranthus L. section Amaranthus: new evidence from studies of morphology and isozymes. The introduction of the closely related weedy taxa of Amaranthus L. section Amaranthus into Europe has resulted in a number of taxonomic problems, especially regarding the rank of A. bouchonii Thell. Electrophoretic separation of five isozymes (phosphoglucoisomerase, phosphoglucomutase, glutamate oxaloacetate transaminase, malate dehydrogenase and menadione reductase) and morphological studies were used to generate new data on this problem, and canonical discriminant analysis of morphometric characters was carried out. The results obtained support the maintenance of A. bouchonii as a distinct taxon, most closely related to A. powellii S. Wats. The origin of this taxon is considered, and the monomorphism of the isozymes studied is discussed in the light of the extensive morphological variation within species in section Amaranthus.
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