<?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>S0187-71512023000100136</article-id>
<article-id pub-id-type="doi">10.21829/abm130.2023.2253</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Graptopetalum irmasoniae (Crassulaceae), una especie nueva de Oaxaca, México, y lectotipificación de G. macdougallii]]></article-title>
<article-title xml:lang="en"><![CDATA[Graptopetalum irmasoniae (Crassulaceae), a new species from Oaxaca, Mexico, and lectotypification of G. macdougallii]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Mendoza]]></surname>
<given-names><![CDATA[Abisaí Josué]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sandoval Gutiérrez]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Santiago]]></surname>
<given-names><![CDATA[Abigail]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Calix]]></surname>
<given-names><![CDATA[Emmanuel]]></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 ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Tlaxiaco  ]]></institution>
<addr-line><![CDATA[Tlaxiaco Oaxaca]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto de Ecología, A.C.  ]]></institution>
<addr-line><![CDATA[Pátzcuaro Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<numero>130</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512023000100136&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512023000100136&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512023000100136&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes y Objetivos: Graptopetalum es un género americano con 22 especies, que tiene su distribución principal en México. En una colección de plantas originarias del municipio San Juan Teita, distrito de Tlaxiaco, Oaxaca, se localizó una nueva especie para la ciencia de este género. Se plantearon como objetivos describirla, ilustrarla y compararla morfológicamente con G. macdougallii, que se considera la especie más afín. Además, se presenta un mapa de la distribución de ambas y se propone un lectotipo para G. macdougallii.  Métodos:  A partir de colectas, revisión de literatura especializada y estudio de ejemplares de herbario en físico y virtuales, se propone una especie nueva de Graptopetalum. Se elaboró su descripción morfológica, una ilustración, un mapa de distribución y se comparó con la especie que presenta mayor semejanza. Se evalúo su estado de conservación de acuerdo con las categorías y criterios de la Lista Roja de la IUCN.  Resultados clave:  Se describe e ilustra Graptopetalum irmasoniae, especie del subgénero Graptopetalum, sección Graptopetalum, serie Stoloniferae. Muestra similitudes con G. macdougallii, de la que se diferencia por el diámetro mayor de la roseta, largo de los estolones, número, tamaño y forma de las hojas e inflorescencia, así como por el tamaño de los segmentos de la corola y el tipo de hábitat. La distribución limitada, bajo número poblacional y fragilidad del hábitat la ubican como especie en Peligro Crítico (CR). Se presenta el mapa de distribución de ambas especies y se lectotipifica a G. macdougallii.  Conclusiones: Graptopetalum irmasoniae es una especie microendémica del estado Oaxaca, México, donde se desarrolla sobre afloramientos de yeso. Es la cuarta especie de la familia en México que se describe para este tipo de suelo y dada la fragilidad de su hábitat, requiere especial atención para conservarla en el corto plazo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background and Aims: Graptopetalum is an American genus with 22 species, which has its main distribution in Mexico. From collections made in the municipality of San Juan Teita, district of Tlaxiaco, Oaxaca, a new species for science of this genus was located. Hence, the objectives were to describe and illustrate it, and compare its morphology with G. macdougallii, which is considered its most closely related species. In addition, a map of the distribution of both species is presented, and a lectotype is proposed for G. macdougallii.  Methods:  Based on collections, review of specialized literature and study of physical and virtual herbarium specimens, a new species of Graptopetalum is proposed. Its morphological description, an illustration, and a distribution map were elaborated, and it was compared with the species that presents the greatest similarity. Its conservation status was evaluated according to the categories and criteria of the IUCN Red List.  Key results: Graptopetalum irmasoniae, species of the subgenus Graptopetalum, section Graptopetalum, series Stoloniferae, is described and illustrated. It shows similarities with G. macdougallii, from which it differs by the larger diameter of the rosette, length of the stolons, number, size and shape of the leaves and inflorescence, as well as by the length of the corolla segments and the type of habitat. The new species is Critically Endangered (CR) because of its limited distribution, low population numbers and habitat fragility. The distribution map of both species is presented, and G. macdougallii is lectotypified.  Conclusions: Graptopetalum irmasoniae is a microendemic species of the state of Oaxaca, Mexico, where it grows on gypsum outcrops. It is the fourth species of the family in Mexico that is described from this type of soil and given the fragility of its habitat, special attention is required to preserve it in the short term.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[endemismo]]></kwd>
<kwd lng="es"><![CDATA[estado de conservación]]></kwd>
<kwd lng="es"><![CDATA[gipsófila]]></kwd>
<kwd lng="es"><![CDATA[serie Stoloniferae]]></kwd>
<kwd lng="es"><![CDATA[Sierra Madre del Sur]]></kwd>
<kwd lng="en"><![CDATA[conservation status]]></kwd>
<kwd lng="en"><![CDATA[endemism]]></kwd>
<kwd lng="en"><![CDATA[gypsophyte]]></kwd>
<kwd lng="en"><![CDATA[Sierra Madre del Sur]]></kwd>
<kwd lng="en"><![CDATA[Stoloniferae series]]></kwd>
</kwd-group>
</article-meta>
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