<?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>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982019000300433</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2189</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Primer registro de la maleza agrícola e invasiva Amaranthus palmeri (Amaranthaceae) para la flora de la Península de Yucatán y un registro actualizado de la diversidad de Amaranthus en la región]]></article-title>
<article-title xml:lang="en"><![CDATA[First record of invasive and agricultural weed Amaranthus palmeri (Amaranthaceae) for the Peninsula of Yucatan flora and an updated record of Amaranthus diversity in the region]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-del Pino]]></surname>
<given-names><![CDATA[Ivonne]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dorantes-Euan]]></surname>
<given-names><![CDATA[Alfredo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ibarra-Morales]]></surname>
<given-names><![CDATA[Ariadna]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro de Investigación Científica de Yucatán A.C.  ]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<volume>97</volume>
<numero>3</numero>
<fpage>433</fpage>
<lpage>446</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982019000300433&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982019000300433&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982019000300433&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes: Amaranthus palmeri es una hierba dioica que se ha convertido en una especie invasora por su capacidad de adaptación y alta resistencia a herbicidas. Es considerada una de las especies más problemáticas para el sector agrícola de Estados Unidos de América, por lo que su documentación es de importancia para una región que alberga una alta biodiversidad y gran actividad agrícola, como la Península de Yucatán.  Problema: Amaranthus palmeri se distribuye en la Península de Yucatán.  Especie de estudio: Amaranthus palmeri S. Watson  Sitio de estudio:  Dos localidades en Yucatán, México, en 2014, 2017 y 2018.  Métodos:  Se examinaron, caracterizaron y midieron caracteres morfológicos de la especie y se ilustraron sus caracteres florales.  Resultados: Amaranthus palmeri es reportado por primera vez en la Península de Yucatán. Se describen los ejemplares colectados, discutiendo sus diferencias y similitudes con otras especies del género en la región. La variación intraespecífica de las poblaciones colectadas es documentada. Una clave actualizada para las especies de Amaranthus en la Península de Yucatán es incluida.  Conclusiones:  Se identificaron 12 especies de Amaranthus distribuidas en la Península de Yucatán, incluyendo el registro de A. palmeri. La variación morfológica en los sépalos de las flores femeninas de A. palmeri podría indicar hibridación, plasticidad fenotípica o variación intraespecífica, los cuales pudieran estar relacionados con su capacidad de adaptación a los sistemas agrícolas y ambientes artificiales que coloniza, por lo que todo el conocimiento que se genere de esta especie puede ayudar a plantear soluciones más eficaces para su control.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background: Amaranthus palmeri is a dioecious weed that has become an invasive species because of its proliferation ability and high resistance to herbicides. This species is considered one of the most troublesome weed species for the United States of America agricultural system, therefore, the documentation of this species is important for a region that harbors high biodiversity as well as many agricultural activities, as the Peninsula of Yucatan.  Question: Amaranthus palmeri is distributed in Peninsula of Yucatan.  Studied species: Amaranthus palmeri S. Watson  Study site:  Two sites in Yucatán, Mexico in 2014, 2017 y 2018.  Methods:  Morphological characters were examined, characterized and measured, and floral characters were photographed.  Results: Amaranthus palmeri is documented for the first time in the Peninsula of Yucatan. The collected specimens are described. Differences and similarities with other species of the genus in the region are discussed. Intraspecific variation of the populations is reported. A key to the species of Amaranthus in the Peninsula of Yucatan is provided.  Conclusions:  Twelve species of Amaranthus were identified in the Yucatan Peninsula, including A. palmeri. The morphological variation of sepals of the female flowers of A. palmeri might indicate hybridization, phenotypic plasticity or intraspecific variation, which might be related to its ability to adapt to the agricultural systems and artificial environments that colonizes; therefore, the generation of knowledge for this species might be helpful in designing more efficient management solutions.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Amaranthus]]></kwd>
<kwd lng="es"><![CDATA[amarantos]]></kwd>
<kwd lng="es"><![CDATA[invasiva]]></kwd>
<kwd lng="es"><![CDATA[maleza]]></kwd>
<kwd lng="es"><![CDATA[morfología floral]]></kwd>
<kwd lng="en"><![CDATA[amaranths]]></kwd>
<kwd lng="en"><![CDATA[Amaranthus]]></kwd>
<kwd lng="en"><![CDATA[flower morphology]]></kwd>
<kwd lng="en"><![CDATA[invasive]]></kwd>
<kwd lng="en"><![CDATA[weed]]></kwd>
</kwd-group>
</article-meta>
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