<?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>S2007-42982019000200250</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2143</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[On the identity of two Mexican species of Ageratina (Eupatorieae, Asteraceae): A. grandifolia and A. rivalis]]></article-title>
<article-title xml:lang="es"><![CDATA[Sobre la identidad de dos especies mexicanas de Ageratina (Eupatorieae, Asteraceae): A. grandifolia y A. rivalis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hinojosa-Espinosa]]></surname>
<given-names><![CDATA[Oscar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villaseñor]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Biología Departamento de Botánica]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of California  ]]></institution>
<addr-line><![CDATA[Davis California]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2019</year>
</pub-date>
<volume>97</volume>
<numero>2</numero>
<fpage>250</fpage>
<lpage>259</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982019000200250&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982019000200250&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982019000200250&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background: Ageratina, with 167 species, constitutes the most diverse genus of the Mexican Asteraceae and the sixth most diverse of the vascular plants in Mexico. The taxonomy of the genus is complex due to its number of species and the numerous inadequately delimited taxa or with intricate and confusing nomenclature. In addition, little known species have sometimes remained under the synonymy of another different species, as in the case of A. rivalis, which has been considered as a synonym of A. grandifolia.  Question:  Is it possible to recognize Ageratina rivalis as a distinct species of A. grandifolia by critically analyzing its circumscription, nomenclature and geographical distribution?  Taxon: Ageratina grandifolia and A. rivalis.  Study site:  Mexico.  Method:  A thorough review of herbarium specimens, field material, descriptions and geographic distribution of the species was made to contrast them.  Results:  Several differences exist in the morphology and geographical distribution of Ageratina rivalis and A. grandifolia. Descriptions, pictures, distribution maps, synonymy and a key to distinguish them from similar species are provided. The presence of A. grandifolia in Mexico City is also documented. Lectotypes are designated for Eupatorium conspicuum, E. conspicuum var. pueblense, E. grandifolium, and E. rivale.  Conclusions:  Morphology and geography support the distinction between A. grandifolia and A. rivalis. However, further research is desirable to corroborate or refute this statement, and especially to clearly circumscribe several similar species that seem to be related. This work contributes to a better understanding of the taxonomy and biogeography of the genus Ageratina in Mexico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes: Ageratina, con 167 especies constituye el género más diverso de las Asteraceae mexicanas y el sexto más diverso de las plantas vasculares en México. Su taxonomía es compleja debido al gran número de especies y a la existencia de taxones inadecuadamente delimitados o con nomenclatura confusa. Además, especies poco conocidas han permanecido bajo sinonimia de otras especies, como ocurre con A. rivalis, la cual ha sido considerada como sinónimo de A. grandifolia.  Pregunta:  ¿Es posible reconocer a Ageratina rivalis como una especie distinta de A. grandifolia analizando críticamente su circunscripción, nomenclatura y distribución geográfica?  Especies de estudio: Ageratina grandifolia y A. rivalis.  Sitio de estudio:  México.  Métodos:  Se hizo una minuciosa revisión de ejemplares de herbario, material en campo, descripciones y distribución geográfica de las especies para contrastarlas.  Resultados:  Se encontraron diferencias morfológicas entre A. rivalis y A. grandifolia. Se proporcionan descripciones, fotos, mapas de distribución, sinonimia y una clave para distinguirlas de especies parecidas. También se documenta la presencia de A. grandifolia en la Ciudad de México. Además, se designan lectotipos para Eupatorium conspicuum, E. conspicuum var. pueblense, E. grandifolium y E. rivale.  Conclusiones:  Tanto su morfología como su geografía apoyan el reconocimiento de Ageratina grandifolia y A. rivalis como especies distintas. Sin embargo, es deseable que se realicen estudios adicionales que puedan corroborar o refutar este postulado, especialmente para circunscribir mejor varias especies similares que al parecer están relacionadas. Este trabajo contribuye a una mejor comprensión de la taxonomía y biogeografía del género Ageratina en México.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[lectotype designation]]></kwd>
<kwd lng="en"><![CDATA[invasive plants]]></kwd>
<kwd lng="en"><![CDATA[medicinal plants]]></kwd>
<kwd lng="en"><![CDATA[ornamental plants]]></kwd>
<kwd lng="en"><![CDATA[taxonomy]]></kwd>
<kwd lng="es"><![CDATA[Designación de lectotipos]]></kwd>
<kwd lng="es"><![CDATA[plantas invasoras]]></kwd>
<kwd lng="es"><![CDATA[plantas medicinales]]></kwd>
<kwd lng="es"><![CDATA[plantas ornamentales]]></kwd>
<kwd lng="es"><![CDATA[taxonomía]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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