<?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>S2007-42982024000401318</article-id>
<article-id pub-id-type="doi">10.17129/botsci.3502</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Synopsis of the genus Polystemma (Apocynaceae, Asclepiadoideae) and recognition of three new species]]></article-title>
</title-group>
<contrib-group>
<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 contrib-type="author">
<name>
<surname><![CDATA[Pío-León]]></surname>
<given-names><![CDATA[Juan Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Sánchez]]></surname>
<given-names><![CDATA[Cristóbal]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Islas-Hernández]]></surname>
<given-names><![CDATA[Carla Sofía]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Departamento de Biología Comparada]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional Herbario CIIDIR]]></institution>
<addr-line><![CDATA[Victoria de Durango Durango]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Jardín Botánico de Vallarta Departamento de Botánica ]]></institution>
<addr-line><![CDATA[ Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>102</volume>
<numero>4</numero>
<fpage>1318</fpage>
<lpage>1352</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982024000401318&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982024000401318&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982024000401318&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Polystemma is characterized by a mixed indumentum of glandular trichomes that turn white, rotate to rotate-campanulate corollas, a gynostegial corona with filiform appendages, and fusiform follicles. The taxon has undergone numerous taxonomic changes in recent years. In current phylogenies, Polystemma has been recovered as paraphyletic and many of its species require a new combination. In this study, we propose the corresponding changes and describe, map, and illustrate three new species within this genus.  Questions:  Do morphological data support the transfer of Matelea species to Polystemma? Are the plants of Polystemma collected in Durango, Jalisco, and Sinaloa different species?  Studied species: Polystemma.  Study site and dates:  United States, Mexico, Guatemala, El Salvador, Honduras, Nicaragua y Costa Rica, between 2014 and 2024.  Methods:  More than 3,000 specimens from 20 herbaria and virtual databases were reviewed. Distribution maps were generated, and risk categories were proposed. The cohesive species concept was proposed as an explanatory hypothesis for taxon recognition.  Results:  A total of 27 species of the genus were recognized, these distributed from the southeastern United States of America to Costa Rica. Eleven new combinations and three lectotypifications are made, and three new species for science are proposed. Identification key, nomenclatural type information, synonyms, habitat, images of all species and distribution maps are also included.  Conclusions:  The review of this genus allowed for updating and improving the systematics within the subtribe Gonolobinae. Likewise, it highlights Mexico as the center of diversity and endemism for Polystemma.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: Polystemma se caracteriza por el indumento mixto, con tricomas glandulares volviéndose blancos, corolas rotadas a rotado-campanuladas, corona ginostegial con apéndices filiformes y folículos fusiformes. El taxón presenta numerosos cambios taxonómicos en los últimos años. En las filogenias recientes, Polystemma se ha recobrado como parafilético y muchas de las especies requieren nuevas combinaciones. Se realizan los cambios correspondientes y se describen tres especies nuevas del género.  Preguntas:  ¿Los datos morfológicos apoyan la transferencia de especies de Matelea a Polystemma? ¿Son especies diferentes las plantas de Polystemma colectadas en Durango, Jalisco y Sinaloa?  Especies de estudio: Polystemma.  Sitio y años de estudio:  Estados Unidos de América, México, Guatemala, El Salvador, Honduras, Nicaragua y Costa Rica, entre 2014 y 2024.  Métodos:  Se revisaron más de 3,000 ejemplares de 20 diferentes herbarios y bases de datos. Se generaron mapas de distribución y proponen categorías de riesgo. Se planteó como hipótesis explicativa el concepto cohesivo de especie para el reconocimiento de los taxones.  Resultados:  Se reconocen 27 especies del género, distribuidas desde el sureste de los Estados Unidos de América hasta Costa Rica. Se proponen once combinaciones nuevas, tres lectotipificaciones y tres especies nuevas. Se incluye una clave de identificación e información sobre tipos, sinónimos, hábitat, imágenes de todas las especies y mapas de distribución.  Conclusiones:  La revisión de este género permitió actualizar la sistemática dentro de la subtribu Gonolobinae. Asimismo, resalta a México como el centro de diversidad y endemismo para Polystemma.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[endemism]]></kwd>
<kwd lng="en"><![CDATA[Gonolobinae]]></kwd>
<kwd lng="en"><![CDATA[explanatory hypotheses]]></kwd>
<kwd lng="en"><![CDATA[Matelea]]></kwd>
<kwd lng="es"><![CDATA[endemismo]]></kwd>
<kwd lng="es"><![CDATA[Gonolobinae]]></kwd>
<kwd lng="es"><![CDATA[hipótesis explicativas]]></kwd>
<kwd lng="es"><![CDATA[Matelea]]></kwd>
</kwd-group>
</article-meta>
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