<?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>1405-2768</journal-id>
<journal-title><![CDATA[Polibotánica]]></journal-title>
<abbrev-journal-title><![CDATA[Polibotánica]]></abbrev-journal-title>
<issn>1405-2768</issn>
<publisher>
<publisher-name><![CDATA[Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-27682005000200073</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[PLANTAS VASCULARES ENDÉMICAS DE LA CUENCA DEL RÍO BALSAS, MÉXICO]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Jiménez]]></surname>
<given-names><![CDATA[Concepción]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández-Nava]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arreguín-Sánchez]]></surname>
<given-names><![CDATA[Ma. de la Luz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Jiménez]]></surname>
<given-names><![CDATA[Adela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Nacional de Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[ DF]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<numero>20</numero>
<fpage>73</fpage>
<lpage>99</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-27682005000200073&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-27682005000200073&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-27682005000200073&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se enlistan 337 especies de plantas vasculares en la cuenca del río Balsas, ubicadas en la categoría de endémicas. Las familias mejor representadas son Compositae con 48 taxones, Leguminosae con 30, Cactaceae 21, Burseraceae y Crassulaceae 17; en las monocotiledóneas destacan Orchidaceae con 24 especies, Bromeliaceae y Liliaceae 16. De la pteridoflora sólo 14 especies se registran como taxones de distribución restringida. El estado mejor representado es Guerrero (82 spp exclusivas) Jalisco el que menos taxones registra (7 spp) y en Tlaxcala no ocurre ninguna especie hasta la fecha. La mayoría de las especies prosperan en el bosque tropical caducifolio y en el matorral xerófilo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The 337 species of vascular plants considered endemic from the Balsas river basin are listed. Basing on the number of taxa, the best represented families are: Compositae 48, Leguminosae 30, Cactaceae 21, Burseraceae and Crassulaceae 17. Among the monocotyledons Orchidaceae 24, Bromeliaceae and Liliaceae 16. From pteridoflora only 14 species were registred as endemics. The best represented state is Guerrero (82 spp exclusive), the state that less species registers is Jalisco (7 spp) and Tlaxcala none. Most of the species were located in tropical deciduous forest and in the xerophytic scrub.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Plantas vasculares]]></kwd>
<kwd lng="es"><![CDATA[endémicas]]></kwd>
<kwd lng="es"><![CDATA[cuenca del río Balsas, México]]></kwd>
<kwd lng="en"><![CDATA[Vascular plants]]></kwd>
<kwd lng="en"><![CDATA[endemics]]></kwd>
<kwd lng="en"><![CDATA[Balsas river basin, México]]></kwd>
</kwd-group>
</article-meta>
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