Nomenclatural survey of the genus Amaranthus (Amaranthaceae s.s.). 8. About Amaranthus polygonoides s.l. and A. anderssonii, two related taxa described from the tropical regions of America with notes on their taxonomy

Duilio Iamonico


Background and Aims: Amaranthus comprises 70-75 species of which about half are native to America. Some taxa are used as ornamentals, food or medicine and escape from cultivation, mainly causing economic impact to the agricultural systems. The genus is taxonomically critical due to its high phenotypic variability and hybridization that caused nomenclatural disorders. A note about Amaranthus polygonoides s.l. and A. anderssonii, whose nomenclature and taxonomy need to be still clarified, is presented.
Methods: This work is based on examination of herbarium specimens and analysis of literature. Taxonomically relevant characters were measured (length and width (the widest part of the blade) of the leaves, longest and shortest diameters of the seeds, ratio length/width of the leaf blades and dehiscence/indehiscence of the fruits). The variability of the continuous characters was illustrated by box plots.
Key results: The names Amaranthus polygonoides, A. anderssonii s.s., A. anderssonii f. erectus, A. taishanensis, Sarratia berlandieri, and Scleropus urceolatus are discussed. A specimen at BM-SL, that served as the base for the lectotype of A. polygonoides (Sloane’s illustration), was indicated. Previous holotype indications for Sarratia berlandieri and Scleropus urceolatus are corrected as lectotypes. Amaranthus taishanensis is confirmed to be a synonym of A. polygonoides s.s. The morphological study of leaves and seeds, as well as data about the distribution and the available phylogenetic analyses, show that the taxa can be distinguished at infraspecific ranks. A new classification is proposed recognizing a single species (A. polygonoides) with two subspecies, subsp. urceolatus comb. nov. and subsp. polygonoides. The latter taxon includes var. berlandieri comb. nov. and var. polygonoides.
Conclusions: Amaranthus polygonoides s.l. and A. anderssonii are native to tropical regions of America, currently treated as separate taxa. The use of box plots, along with the available phylogenetic analyses, helped to clarify their taxonomy.

Palabras clave

Amaranthus berlandieri, A. taishanensis, A. urceolatus, distribution, Amaranthus subg. Albersia, typification.


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Acta Botanica Mexicana, Núm. 127, 2020. Publicación continua editada por el Instituto de Ecología, A.C., a través del Centro Regional del Bajío.

Editor responsable: Marie-Stéphanie Samain. Reservas de Derechos al Uso Exclusivo No. 04-2016-062312171000-203, ISSN electrónico 2448-7589, ambos otorgados por el Instituto Nacional del Derecho de Autor.

Responsable de la última actualización: Marie-Stéphanie Samain. Ave. Lázaro Cárdenas 253, C.P. 61600 Pátzcuaro, Michoacán, México. Tel. +52 (434) 117 95 13, fecha de última actualización, 7 de enero de 2020.

ISSN electrónico: 2448-7589

Acta Botanica Mexicana se distribuye bajo una  Licencia Creative Commons Atribución-NoComercial 4.0 Internacional.

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