<?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>1870-3453</journal-id>
<journal-title><![CDATA[Revista mexicana de biodiversidad]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Biodiv.]]></abbrev-journal-title>
<issn>1870-3453</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Biología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-34532021000100102</article-id>
<article-id pub-id-type="doi">10.22201/ib.20078706e.2021.92.3739</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Biogeographic analysis of the American genus Echeandia (Agavoideae: Asparagaceae)]]></article-title>
<article-title xml:lang="es"><![CDATA[Análisis biogeográfico del género americano Echeandia (Agavoideae: Asparagaceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz-Brunel]]></surname>
<given-names><![CDATA[Juan Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Munguía-Lino]]></surname>
<given-names><![CDATA[Guadalupe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A3"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro-Castro]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[Aarón]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Guadalajara Centro Universitario de Ciencias Biológicas y Agropecuarias Departamento de Botánica y Zoología]]></institution>
<addr-line><![CDATA[ ]]></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[Zapopan Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Guadalajara Centro Universitario de Ciencias Biológicas y Agropecuarias Departamento de Botánica y Zoología]]></institution>
<addr-line><![CDATA[Zapopan Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional ]]></institution>
<addr-line><![CDATA[Durango Durango]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<volume>92</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-34532021000100102&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-34532021000100102&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-34532021000100102&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Echeandia (Asparagaceae) is an American genus of herbaceous geophytes. Its distribution is heterogeneous but concentrates along the Mexican Transition Zone (MTZ). We analyzed the species richness distribution and endemism of the group. We compiled a data base of 2,078 records obtained by revision of herbarium specimens, scientific publications, and electronic databases. Species richness was quantified under 4 different criteria. Also, we estimated the weighted endemism and the corrected weighted endemism index to detect centers of endemism. We identified 85 species and registered 74 in Mexico. The MTZ had 61 species and the Sierra Madre del Sur province was the most diverse with 39. The richest cell was located in the Transmexican Volcanic Belt and contained 12 species. In addition, 63 species (85.1%) present in Mexico were endemic. Weighted endemism showed 5 cells in the Sierra Madre del Sur and Balsas Basin in Mexico. In contrast, almost all the high valued cells of corrected weighted endemism index were located in South America. The results were congruent with the patterns of the geophytes and endemic angiosperms of Mexico. The MTZ has a complex tectonic, volcanic and climatic history. These factors have promoted the diversification of several angiosperm lineages, including Echeandia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Echeandia (Asparagaceae) es un género americano de geófitas herbáceas. Su distribución es heterogénea, pero concentrada a lo largo de la Zona de Transición Mexicana (ZTM). Analizamos la distribución de la riqueza de especies y el endemismo del grupo. Compilamos una base de datos de 2,078 registros a partir de especímenes de herbario revisados, publicaciones científicas y bases de datos electrónicas. Cuantificamos la riqueza de especies usando 4 criterios distintos. Además, estimamos el endemismo ponderado y el índice de endemismo ponderado corregido para detectar centros de endemismo. Identificamos 85 especies y registramos 74 en México. La ZTM contuvo 61 especies y la Sierra Madre del Sur destacó con 39. La celda más rica se ubicó en el Eje Volcánico Transmexicano con 12 especies. Además, 63 especies (85.1%) presentes en México fueron endémicas. El análisis de endemismo ponderado mostró 5 celdas en la Sierra Madre del Sur y la Cuenca del Balsas en México. En contraste, casi todas las celdas con alto valor del índice de endemismo ponderado corregido se ubicaron en Sudamérica. Los resultados fueron congruentes con los patrones presentados por las geófitas y angiospermas endémicas de México. La ZTM tiene una compleja historia tectónica, volcánica y climática, factores que promovieron la diversificación de varios linajes de angiospermas, incluido Echeandia.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Geophyte]]></kwd>
<kwd lng="en"><![CDATA[Mexican Transition Zone]]></kwd>
<kwd lng="en"><![CDATA[Sierra Madre del Sur]]></kwd>
<kwd lng="en"><![CDATA[Species richness]]></kwd>
<kwd lng="es"><![CDATA[Geófita]]></kwd>
<kwd lng="es"><![CDATA[Zona de Transición Mexicana]]></kwd>
<kwd lng="es"><![CDATA[Sierra Madre del Sur]]></kwd>
<kwd lng="es"><![CDATA[Riqueza de especies]]></kwd>
</kwd-group>
</article-meta>
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