<?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>S2007-42982025000100311</article-id>
<article-id pub-id-type="doi">10.17129/botsci.3600</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Una especie nueva de Polystemma (Apocynaceae) de Aguascalientes, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ocampo]]></surname>
<given-names><![CDATA[Gilberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Ramírez]]></surname>
<given-names><![CDATA[Julio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarado-Cárdenas]]></surname>
<given-names><![CDATA[Leonardo O.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Aguascalientes Centro de Ciencias Básicas Departamento de Biología]]></institution>
<addr-line><![CDATA[ Aguascalientes]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Laboratorio de Plantas Vasculares]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2025</year>
</pub-date>
<volume>103</volume>
<numero>1</numero>
<fpage>311</fpage>
<lpage>318</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982025000100311&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982025000100311&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982025000100311&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: Polystemma tiene alrededor de 27 especies distribuidas desde el sureste de Estados Unidos hasta el centro de Costa Rica. Actividades de recolecta botánica detectaron la presencia de una especie del género, que no coincide con algún taxón conocido.  Preguntas:  ¿Los ejemplares recolectados corresponden a una especie nueva? ¿Cuál es su estado de conservación?  Especies de estudio: Polystemma margaritadelacerdae.  Sitio y años de estudio:  Aguascalientes, 2022-2024.  Métodos:  Se revisaron especímenes recolectados recientemente, para elaborar una descripción morfológica. Se evaluó su estado de conservación siguiendo los lineamientos de la Lista Roja de la IUCN.  Resultados: Polystemma margaritadelacerdae se propone como especie nueva, debido a la presencia de una corola verde, una corona ginostegial exerta, cilíndrica, con lóbulos fimbriados a denticulados. Hasta el momento, se considera como una especie en la categoría de Vulnerable (VU).  Conclusiones:  Se describe una especie nueva de Polystemma, con lo cual las especies de Apocynaceae presentes en Aguascalientes se incrementa a 25.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Polystemma has about 27 species distributed from southeastern United States to central Costa Rica. Plant collecting activities detected one taxon that does not fit the description of previously known species of the genus.  Questions: Do the collected specimens belong to a new species? What is its conservation status?  Studied species: Polystemma margaritadelacerdae.  Study site and dates: Aguascalientes, 2022-2024.  Methods: Recently collected plant material was studied to prepare a morphological description. The conservation status of the new taxon was evaluated, following the IUCN Red List criteria.  Results: Polystemma margaritadelacerdae is proposed as a new species because of the presence of a green corolla, an exserted cylindrical gynostegial corona, with a fimbriate to denticulate lobe apex. At the moment, the new taxon is categorized as Vulnerable (VU).  Conclusions: A new species of Polystemma is described and the number of Apocynaceae species that occur in Aguascalientes increases to 25.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Asclepiadoideae]]></kwd>
<kwd lng="es"><![CDATA[centro de México]]></kwd>
<kwd lng="es"><![CDATA[matorral subtropical]]></kwd>
<kwd lng="es"><![CDATA[novedad taxonómica]]></kwd>
<kwd lng="en"><![CDATA[Asclepiadoideae]]></kwd>
<kwd lng="en"><![CDATA[central Mexico]]></kwd>
<kwd lng="en"><![CDATA[subtropical shrubland]]></kwd>
<kwd lng="en"><![CDATA[taxonomic novelty.]]></kwd>
</kwd-group>
</article-meta>
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<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Woodson]]></surname>
<given-names><![CDATA[RE]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The North American Asclepiadaceae I. Perspective of the genera]]></article-title>
<source><![CDATA[Annals of the Missouri Botanical Garden]]></source>
<year>1941</year>
<volume>28</volume>
<page-range>193-224</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
