<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0187-7151</journal-id>
<journal-title><![CDATA[Acta botánica mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Act. Bot. Mex]]></abbrev-journal-title>
<issn>0187-7151</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C., Centro Regional del Bajío]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-71512020000100126</article-id>
<article-id pub-id-type="doi">10.21829/abm127.2020.1687</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Nomenclature 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.]]></article-title>
<article-title xml:lang="es"><![CDATA[Estudio de nomenclatura del género Amaranthus (Amaranthaceae s.s.). 8. Sobre Amaranthus polygonoides s.l. y A. anderssonii, dos taxones relacionados descritos de las regiones tropicales de América con notas sobre su taxonomía.]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Iamonico]]></surname>
<given-names><![CDATA[Duilio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Rome Sapienza Department Department of Planning, Design, and Technology of Architecture ]]></institution>
<addr-line><![CDATA[Rome ]]></addr-line>
<country>Italy</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<numero>127</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512020000100126&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512020000100126&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512020000100126&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  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&#8217;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.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes y Objetivos: Amaranthus comprende 70-75 especies, de las cuales cerca de la mitad son nativas de América. Algunas especies son usadas como ornamentales, alimento o medicina y escapan de cultivo causando daños económicos a los sistemas agriculturales. El género tiene interés crítico debido a su alta variabilidad fenotípica e hibridación, lo que ha generado desorden nomenclatural. Se presenta una nota sobre Amaranthus polygonoides y A. andressonii, cuya nomenclatura y taxonomía todavía necesita ser clarificada.  Métodos: Este trabajo está basado en la revisión de especímenes de herbario y el análisis de la literatura. Se midieron caracteres taxonómicamente relevantes (longitud y ancho (parte más ancha de la lámina) de las hojas, relación largo/ancho de las hojas, tamaño de la hoja, diámetro más largo y más corto de las semillas y dehiscencia/indehiscencia de los frutos). La variabilidad de los caracteres continuos se ilustró con diagramas de caja.  Resultado clave:  Los nombres Amaranthus polygonoides, A. anderssonii s.s., A. anderssonii f. erectus, A. taishanensis, Sarratia berlandieri y Scleropus urceolatus son discutidos. Se indicó un espécimen en BM-SL que sirvió de base para el lectotipo de A. polygonoides (Ilustración de Sloane). Reportes previos de holotipos para Sarratia berlandieri y Scleropus urceolatus son corregidos como lectotipos. Amaranthus taishanensis se confirma como un sinónimo de A. polygonoides subsp. polygonoides. El estudio morfológico de las hojas y semillas, así como datos sobre la distribución y los análisis filogenéticos disponibles, muestran que los taxa pueden ser distinguidos en rangos infraespecíficos. Se propone una clasificación nueva, reconociendo una sola especie, A. polygonoides, con dos subespecies, subsp. urceolatus comb. nov. y subsp. polygonoides. Este último taxón incluye var. berlandieri comb. nov. y var. polygonoides.  Conclusiones: Amaranthus polygonoides s.l. y A. anderssonii son nativos de las regiones tropicales de América y actualmente se consideran como taxones separados. El uso de diagramas de caja, junto con los análisis filogenéticos disponibles, ayudó a aclarar su taxonomía.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Amaranthus berlandieri]]></kwd>
<kwd lng="en"><![CDATA[A. taishanensis]]></kwd>
<kwd lng="en"><![CDATA[A. urceolatus]]></kwd>
<kwd lng="en"><![CDATA[distribution]]></kwd>
<kwd lng="en"><![CDATA[Amaranthus subg. Albersia]]></kwd>
<kwd lng="en"><![CDATA[typification]]></kwd>
<kwd lng="es"><![CDATA[A. berlandieri]]></kwd>
<kwd lng="es"><![CDATA[A. taishanensis]]></kwd>
<kwd lng="es"><![CDATA[A. urceolatus]]></kwd>
<kwd lng="es"><![CDATA[distribución]]></kwd>
<kwd lng="es"><![CDATA[Amaranthus subg. Albersia]]></kwd>
<kwd lng="es"><![CDATA[tipificación]]></kwd>
</kwd-group>
</article-meta>
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