<?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>S0187-71512020000100202</article-id>
<article-id pub-id-type="doi">10.21829/abm127.2020.1626</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[A new species of Cochemiea (Cactaceae, Cacteae) from Sinaloa, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Una nueva especie de Cochemiea (Cactaceae, Cacteae) de Sinaloa, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Morales]]></surname>
<given-names><![CDATA[Leccinum J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González González]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Jiménez]]></surname>
<given-names><![CDATA[Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Iamonico]]></surname>
<given-names><![CDATA[Duilio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de Ciudad Victoria Departamento de Posgrado e Investigación ]]></institution>
<addr-line><![CDATA[Ciudad Victoria Tamaulipas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Museo del Desierto  ]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of Rome Sapienza Department Department of Planning ]]></institution>
<addr-line><![CDATA[Rome ]]></addr-line>
<country>Italy</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<numero>127</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512020000100202&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512020000100202&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512020000100202&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background and Aims: Cochemiea is a genus which currently comprises five species occurring in Mexico. It is morphologically characterized by cylindrical decumbent to prostrate stems and by a long red-scarlet zygomorphic perianth, presumably specialized for hummingbird pollination. As part of the ongoing taxonomic studies on the North Mexican flora, a population discovered by Thomas Linzen in 2012 in central Sinaloa (Mexico), previously identified as Mammillaria sp., actually refers to a Cochemiea species and cannot be ascribed to any of the known species of that genus. As a consequence, we here propose to describe this population as a a new species for science.  Methods: The work is based on field surveys (autumn 2018 and spring 2019) in central Sinaloa, examination of herbarium specimens, and analysis of relevant literature. Its conservation status was assessed following the guidelines of the IUCN; AOO and EOO were calculated with the program GeoCAT.  Key results: Cochemiea thomasii is described and illustrated from Sinaloa. The new species is morphologically similar to C. halei from which it differs by the hanging stems, the larger conical tubercles, less numerous and shorter central spines, and the ovoid fruits. A diagnostic key of the known Cochemiea species is included.  Conclusions: Cochemiea thomasii is endemic to the state of Sinaloa where it occupies a small area. On the basis of the criteria B2a (geographic range) and C (small population) of IUCN, the new species can be assessed as Critically Endangered (CR) or Vulnerable (VU). Adopting the precautionary approach, Cochemiea thomasii is considered as Critically Endangered (CR).]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes y Objetivos: Cochemiea es un género que actualmente comprende cinco especies que se encuentran en México, y se caracteriza morfológicamente por sus tallos decumbentes cilíndricos o postrados y por su largo perianto zigomorfo rojo escarlata presumiblemente especializado para la polinización por colibríes. Como parte de los estudios taxonómicos en curso sobre la flora del norte de México proponemos como nueva especie una población descubierta por Thomas Linzen en 2012 en el centro de Sinaloa (México), previamente identificada como Mammillaria sp., se trata de una especie de Cochemiea que no concuerda con ninguna especie conocida del género, la cual proponemos como nueva especie para la ciencia.  Métodos: Este trabajo se basa en estudios de campo (otoño 2018 y primavera 2019) en el centro de Sinaloa, la revisión de ejemplares de herbario y de literatura relevante. Se evaluó su estatus de conservación siguiendo los lineamientos propuestos por la IUCN; AOO y EOO fueron calculados usando el programa GeoCAT.  Resultados clave: Cochemiea thomasii es descrita e ilustrada de Sinaloa. Esta nueva especie es morfológicamente similar a C. halei, de la cual difiere por sus tallos colgantes, los tubérculos cónicos más grandes, las espinas radiales menos numerosas y más cortas, y los frutos ovoides. Se incluye una clave diagnóstica de las especies conocidas de Cochemiea.  Conclusiones: Cochemiea thomasii es endémica del estado de Sinaloa donde vive en un área reducida. Con base en los criterios B2a (distribución geográfica) y C (población pequeña) de la IUCN, esta especie se evalúa como En Peligro Crítico (CR) o Vulnerable (VU). Adoptando el principio de precaución, Cochemiea thomasii es considerada en Peligro Crítico (CR).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cochemiea halei]]></kwd>
<kwd lng="en"><![CDATA[Cochemiea thomasii]]></kwd>
<kwd lng="en"><![CDATA[endémico]]></kwd>
<kwd lng="en"><![CDATA[Sierra Madre Occidental]]></kwd>
<kwd lng="es"><![CDATA[Cochemiea halei]]></kwd>
<kwd lng="es"><![CDATA[Cochemiea thomasii]]></kwd>
<kwd lng="es"><![CDATA[endemic]]></kwd>
<kwd lng="es"><![CDATA[Sierra Madre Occidental]]></kwd>
</kwd-group>
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