<?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>S0187-71512024000100107</article-id>
<article-id pub-id-type="doi">10.21829/abm131.2024.2270</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Another new species of the genus Dahlia (Asteraceae, Coreopsideae): are we close to knowing its total diversity?]]></article-title>
<article-title xml:lang="es"><![CDATA[Otra especie nueva del género Dahlia (Asteraceae, Coreopsideae): ¿estamos cerca de conocer su diversidad total?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-Santiago]]></surname>
<given-names><![CDATA[Jerónimo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz-Brunel]]></surname>
<given-names><![CDATA[Juan Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lichter-Marck]]></surname>
<given-names><![CDATA[Isaac H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro-Castro]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Biología ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Guadalajara Centro Universitario de Ciencias Biológicas y Agropecuarias Departamento de Botánica y Zoología]]></institution>
<addr-line><![CDATA[ Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,California Academy of Sciences Department of Botany ]]></institution>
<addr-line><![CDATA[ California]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional ]]></institution>
<addr-line><![CDATA[Durango ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional ]]></institution>
<addr-line><![CDATA[ Durango]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<numero>131</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512024000100107&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512024000100107&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512024000100107&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background and Aims:  The genus Dahlia is culturally and economically appreciated. The botanical explorations in richness areas for Dahlia still provide taxonomic novelties. The aims of this communication are to describe the new species D. gypsicola, and compare it morphologically and ecologically with D. calzadana, providing a distribution map, illustrations, an identification key for Dahlia of the Cañada-Mixteca biocultural region in Oaxaca, Mexico, and a species accumulation analysis.  Methods:  Our study was based on field exploration, herbarium material revision, and analysis of living collections. The conservation status was determined based on range size, and criteria and categories of the IUCN Red List. To measure the sampling effort, a predictive species richness analysis was calculated considering 41 taxa of Dahlia and 2297 herbarium records collected between 1791-2021.  Key results: Dahlia gypsicola is a member of Dahlia section Dahlia, morphologically related to D. calzadana. It differs by the herbaceous habit, semi-succulent leaves and stems, smaller petioles and capitulum, more capitula per synflorescence, and fewer disk florets per capitulum. Moreover, both species are allopatric and do not share ecological preferences and phenology. The category of Critically Endangered (CR B1a) is proposed for D. gypsicola, and Endangered (EN B1a) for D. calzadana. The species prediction richness shows that the number of known Dahlia species is almost complete: the inventory is approaching 95% and the predicted number of species is close to 43.  Conclusions: A complete knowledge of the diversity in Dahlia could enhance plant breeding programs with economic and cultural impacts, because the possibilities of generating new cultivars are many. It is recommended to continue the explorations and increase botanical collections; undescribed species may exist where gypsophyte centers of endemism overlap with richness areas of Dahlia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes y Objetivos:  El género Dahlia es cultural y económicamente apreciado. Las exploraciones botánicas en áreas de riqueza para Dahlia siguen aportando novedades taxonómicas. Los objetivos de esta comunicación son describir a la nueva especie D. gypsicola, y compararla morfológica y ecológicamente con D. calzadana, proveer un mapa de distribución, ilustraciones, una clave de identificación para Dahlia de la región biocultural Cañada-Mixteca en Oaxaca, México, y análisis de acumulación de especies.  Métodos:  Nuestro estudio se basó en exploraciones de campo, revisión de especímenes de herbario y análisis de colecciones vivas. Se determinó el estado de conservación considerando el área de distribución y criterios y categorías de la Lista Roja de la UICN. Para medir el esfuerzo de muestreo se realizó un análisis predictivo de riqueza considerando 41 especies de Dahlia y 2297 registros de herbario recolectados entre 1791-2021.  Resultados clave: Dahlia gypsicola es miembro de Dahlia sección Dahlia; relacionada morfológicamente con D. calzadana. Se diferencia por el hábito herbáceo, hojas y tallos semisuculentos, peciolos y capítulos más pequeños, más capítulos por sinflorescencia y menos flores del disco por capítulo. Además, ambas especies son alopátricas y no comparten preferencias ecológicas ni fenología. Se propone la categoría En Peligro Crítico (CR B1a) para D. gypsicola y En Peligro (EN B1a) para D. calzadana. Los predictores de riqueza muestran que el número de especies conocidas de Dahlia está casi completo: el inventario se acerca al 95% y el número previsto de especies es cercano a 43.  Conclusiones:  Un conocimiento completo de la diversidad de Dahlia podría potenciar programas de fitomejoramiento con impactos económicos y culturales, porque las posibilidades de generar nuevos cultivares son amplias. Se recomienda continuar explorando e incrementar las colecciones botánicas, porque pueden existir especies no descritas donde los centros de endemismo de gipsófitas se superponen con áreas de riqueza de Dahlia.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Balsas Basin]]></kwd>
<kwd lng="en"><![CDATA[gypsicolous flora]]></kwd>
<kwd lng="en"><![CDATA[Santiago Juxtlahuaca]]></kwd>
<kwd lng="en"><![CDATA[Sierra Madre del Sur]]></kwd>
<kwd lng="en"><![CDATA[Tehuacán-Cuicatlán Valley]]></kwd>
<kwd lng="es"><![CDATA[Cuenca del Balsas]]></kwd>
<kwd lng="es"><![CDATA[flora gipsícola]]></kwd>
<kwd lng="es"><![CDATA[Santiago Juxtlahuaca]]></kwd>
<kwd lng="es"><![CDATA[Sierra Madre del Sur]]></kwd>
<kwd lng="es"><![CDATA[Valle de Tehuacán-Cuicatlán]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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