<?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>S0187-71512019000100128</article-id>
<article-id pub-id-type="doi">10.21829/abm126.2019.1464</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Una nueva especie de Muhlenbergia (Poaceae, Chloridoideae, Cynodonteae) del estado de Guerrero, México]]></article-title>
<article-title xml:lang="en"><![CDATA[A new species of Muhlenbergia (Poaceae, Chloridoideae, Cynodonteae) from the state of Guerrero, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vigosa-Mercado]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fonseca Juárez]]></surname>
<given-names><![CDATA[Rosa María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[Cd. Mx. ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Posgrado en Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[Cd. Mx. ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<numero>126</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512019000100128&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512019000100128&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512019000100128&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes y Objetivos:  Muhlenbergia es el género más diverso de Poaceae en México. Durante el desarrollo del estudio taxonómico del género en el estado de Guerrero, se encontró material proveniente del municipio de Chilapa que no pudo ser asignado a ninguna de las especies conocidas, por lo que en el presente trabajo se propone una nueva especie.  Métodos: Se examinó el material de herbario de la nueva especie y se comparó con ejemplares de especies mexicanas de Muhlenbergia depositados en las colecciones CHAPA, ENCB, FCME, IEB, MEXU, UAGC y UAMIZ. Se observó la anatomía del corte transversal de la lámina foliar y micromorfología de la lema de la nueva especie y de M. watsoniana, que es el taxon más cercano a la nueva especie.  Resultados clave: Se describe e ilustra a M. cristaliae. La nueva especie comparte algunas características morfológicas con especies con glumas uninervadas del complejo de M. montana; aunque la más cercana es M. watsoniana, de la cual difiere en la anatomía de la lámina foliar y micromorfología de la lema, entre otras características macroscópicas.  Conclusiones:  Muhlenbergia cristaliae se considera endémica de Guerrero y, por el momento, sin información suficiente para evaluar su estado de conservación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background and Aims:  Muhlenbergia is the most diverse genus of Poaceae in Mexico. During the development of the taxonomic study of the genus in Guerrero, herbarium material was found that could not be assigned to any known species. Therefore, it is proposed as a new species in this article.  Methods: Herbarium material of the new species was examined and compared with specimens of Mexican species of Muhlenbergia deposited in the collections CHAPA, ENCB, FCME, IEB, MEXU, UAGC and UAMIZ. Anatomy of the transversal section of the leaf blade and micromorphology of the lemma of the new species and M. watsoniana, which is the closest species, were observed.  Key results:  Muhlenbergia cristaliae is illustrated and described. This new species shares some morphological characteristics with species that possess uninervate glumes of the M. montana complex. Although the closest species is M. watsoniana, it differs with respect to the anatomy of the leaf blade and micromorphology of the lemma, among other macroscopic characteristics.  Conclusions:  Muhlenbergia cristaliae is considered endemic to Guerrero, without sufficient data to evaluate its conservation status for now.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Chilapa]]></kwd>
<kwd lng="es"><![CDATA[gramíneas]]></kwd>
<kwd lng="es"><![CDATA[monocotiledóneas]]></kwd>
<kwd lng="es"><![CDATA[Sierra Madre del Sur]]></kwd>
<kwd lng="en"><![CDATA[Chilapa]]></kwd>
<kwd lng="en"><![CDATA[grasses]]></kwd>
<kwd lng="en"><![CDATA[monocotyledons]]></kwd>
<kwd lng="en"><![CDATA[Sierra Madre del Sur]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Beetle]]></surname>
<given-names><![CDATA[A. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Miranda]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Jaramillo]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[A. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Aragón]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Vergara]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Chimal]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Domínguez]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
</person-group>
<source><![CDATA[Las gramíneas de México IV]]></source>
<year>1995</year>
<page-range>32-214</page-range><publisher-loc><![CDATA[Cd. Mx., México ]]></publisher-loc>
<publisher-name><![CDATA[Secretaría de Agricultura y Recursos Hidráulicos]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Dávila]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Mejía-Saulés]]></surname>
<given-names><![CDATA[M. T.]]></given-names>
</name>
<name>
<surname><![CDATA[Soriano-Martínez]]></surname>
<given-names><![CDATA[A. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Herrera-Arrieta]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Conocimiento taxonómico de la familia Poaceae en México]]></article-title>
<source><![CDATA[Botanical Sciences]]></source>
<year>2018</year>
<volume>96</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>462-514</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Giraldo-Cañas]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Peterson]]></surname>
<given-names><![CDATA[P. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[El género Muhlenbergia (Poaceae: Chloridoideae: Cynodonteae: Muhlenbergiinae) en Colombia]]></article-title>
<source><![CDATA[Caldasia]]></source>
<year>2009</year>
<volume>31</volume>
<page-range>269-302</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="">
<collab>GH</collab>
<source><![CDATA[Harvard University Herbaria, digital collections]]></source>
<year>2018</year>
<publisher-loc><![CDATA[Cambridge ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Herrera-Arrieta]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A revision of the Muhlenbergia montana (Nutt.) Hitchc. complex (Poaceae: Chloridoideae)]]></article-title>
<source><![CDATA[Brittonia]]></source>
<year>1998</year>
<volume>50</volume>
<page-range>23-50</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Herrera-Arrieta]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<source><![CDATA[Las gramíneas de Durango]]></source>
<year>2001</year>
<page-range>478</page-range><publisher-loc><![CDATA[Cd. Mx., México ]]></publisher-loc>
<publisher-name><![CDATA[Instituto Politécnico Nacional]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Herrera-Arrieta]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Peterson]]></surname>
<given-names><![CDATA[P. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Muhlenbergia (Poaceae) de Chihuahua, México]]></article-title>
<source><![CDATA[Sida, Botanical Miscellany]]></source>
<year>2007</year>
<volume>29</volume>
<page-range>1-109</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Herrera-Arrieta]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Peterson]]></surname>
<given-names><![CDATA[P. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Familia Gramineae, subfamilia Chloridoideae I (género Muhlenbergia)]]></article-title>
<source><![CDATA[Flora del Bajío y de regiones adyacentes]]></source>
<year>2017</year>
<volume>199</volume>
<page-range>1-130</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Herrera-Arrieta]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Rzedowski]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Gramineae]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Rzedowski]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Rzedowski]]></surname>
<given-names><![CDATA[G. Calderón de]]></given-names>
</name>
</person-group>
<source><![CDATA[Flora fanerogámica del Valle de México]]></source>
<year>2001</year>
<page-range>999-1114</page-range><publisher-loc><![CDATA[Pátzcuaro, México ]]></publisher-loc>
<publisher-name><![CDATA[Instituto de Ecología A.C.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Herrera-Arrieta]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Peterson]]></surname>
<given-names><![CDATA[P. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Cortés]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Gramíneas de Zacatecas]]></article-title>
<source><![CDATA[Sida, Botanical Miscellany]]></source>
<year>2010</year>
<volume>32</volume>
<page-range>1-239</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="">
<source><![CDATA[Internacional Union for Conservation of Nature. Red List Categories and Criteria, versión 3.1]]></source>
<year>2012</year>
<edition>2</edition>
<page-range>34</page-range><publisher-loc><![CDATA[Gland, Suiza ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="">
<collab>JSTOR</collab>
<source><![CDATA[Global Plants]]></source>
<year>2018</year>
<publisher-loc><![CDATA[Ithaka, New York, USA ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Herbarium Catalogue, Royal Botanic Gardens, Kew]]></source>
<year>2018</year>
<publisher-loc><![CDATA[London, UK ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kellogg]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Poaceae]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Kubitzki]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<source><![CDATA[The families and genera of vascular plants XIII]]></source>
<year>2015</year>
<page-range>416</page-range><publisher-loc><![CDATA[Berlin, Germany ]]></publisher-loc>
<publisher-name><![CDATA[Springer-Verlag]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[McVaugh]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Gramineae]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Anderson]]></surname>
<given-names><![CDATA[W. R.]]></given-names>
</name>
</person-group>
<source><![CDATA[Flora Novo-Galiciana]]></source>
<year>1983</year>
<volume>14</volume>
<page-range>1-436</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mejía-Saulés]]></surname>
<given-names><![CDATA[M. T.]]></given-names>
</name>
<name>
<surname><![CDATA[Dávila]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<source><![CDATA[Cuadernos del Instituto de Biología 16: Gramíneas útiles de México]]></source>
<year>1992</year>
<page-range>298</page-range><publisher-loc><![CDATA[Cd. Mx., México ]]></publisher-loc>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="book">
<collab>NY</collab>
<source><![CDATA[C.V. Starr Virtual Herbarium]]></source>
<year>2018</year>
<publisher-loc><![CDATA[New York, USA ]]></publisher-loc>
<publisher-name><![CDATA[New York Botanical Garden]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peterson]]></surname>
<given-names><![CDATA[P. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Lemma micromorphology in the annual Muhlenbergia (Poaceae)]]></article-title>
<source><![CDATA[The Southwestern Naturalist]]></source>
<year>1989</year>
<volume>34</volume>
<page-range>61-71</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peterson]]></surname>
<given-names><![CDATA[P. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Romaschenko]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Johnson]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A phylogeny and classification of the Muhlenbergiinae (Poaceae: Chloridoideae: Cynodonteae) based on plastid and nuclear DNA sequences]]></article-title>
<source><![CDATA[American Journal of Botany]]></source>
<year>2010</year>
<volume>97</volume>
<numero>9</numero>
<issue>9</issue>
<page-range>1532-54</page-range></nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peterson]]></surname>
<given-names><![CDATA[P. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Valdés-Reyna]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Herrera-Arrieta]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Muhlenbergiinae (Poaceae: Chloridoideae: Cynodonteae): from northeastern México]]></article-title>
<source><![CDATA[Journal of the Botanical Research Institute of Texas]]></source>
<year>2007</year>
<volume>1</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>933-1000</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Soreng]]></surname>
<given-names><![CDATA[R. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Peterson]]></surname>
<given-names><![CDATA[P. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Romaschenko]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Davidse]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Teisher]]></surname>
<given-names><![CDATA[J. K.]]></given-names>
</name>
<name>
<surname><![CDATA[Clark]]></surname>
<given-names><![CDATA[L. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Barberá]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Gillespie]]></surname>
<given-names><![CDATA[L. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Zuloaga]]></surname>
<given-names><![CDATA[F. O.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A worldwide phylogenetic classification of the Poaceae (Gramineae) II: An update and a comparison of two 2015 classifications]]></article-title>
<source><![CDATA[Journal of Systematics and Evolution]]></source>
<year>2017</year>
<volume>55</volume>
<page-range>259-90</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="">
<collab>TROPICOS</collab>
<source><![CDATA[Tropicos.org]]></source>
<year>2018</year>
<publisher-loc><![CDATA[Missouri, USA ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="book">
<collab>US</collab>
<source><![CDATA[National Museum of Natural History. Botany Collections]]></source>
<year>2018</year>
<publisher-loc><![CDATA[Washington, D.C., USA ]]></publisher-loc>
<publisher-name><![CDATA[Smithsonian Institution]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Valdés-Reyna]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Las gramíneas de Coahuila]]></source>
<year>2015</year>
<page-range>556</page-range><publisher-loc><![CDATA[Cd. Mx., México ]]></publisher-loc>
<publisher-name><![CDATA[Comisión Nacional para el Conocimiento y Uso de la Biodiversidad]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Villaseñor]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Checklist of the native vascular plants of Mexico]]></article-title>
<source><![CDATA[Revista Mexicana de Biodiversidad]]></source>
<year>2016</year>
<volume>87</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>559-902</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
