<?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>S0187-71512004000100023</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Las especies de Bursera (Burseraceae) en la cuenca superior del río Papaloapan (México)]]></article-title>
<article-title xml:lang="en"><![CDATA[The species of Bursera (Burseraceae) in the upper Papaloapan river basin (México)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rzedowski]]></surname>
<given-names><![CDATA[Jerzy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medina Lemus]]></surname>
<given-names><![CDATA[Rosalinda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Calderón de Rzedowski]]></surname>
<given-names><![CDATA[Graciela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Ecología, A.C  ]]></institution>
<addr-line><![CDATA[Pátzcuaro Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto de Biología, Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[D.F ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<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>2004</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2004</year>
</pub-date>
<numero>66</numero>
<fpage>23</fpage>
<lpage>151</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512004000100023&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512004000100023&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512004000100023&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La cuenca superior del Papaloapan se define en el presente trabajo como la porción suroccidental de esta región hidrográfica ubicada por encima de la cota altitudinal de 400 m y abarca un territorio de alrededor de 21,000 km2, repartido entre los estados de Oaxaca, Puebla y Veracruz. Con base en el estudio de más de 900 ejemplares de Bursera, procedentes de la comarca, se define la existencia de 21 especies, de las que dos (B. graveolens (H.B.K.) Tr. &amp; Planch. y B. hintonii Bullock) no se conocían previamente de la zona, una cambia de nombre (B. linanoe (La Llave) comb. nova, en lugar de B. aloexylon (Schiede ex Schltdl.) Engl. y tres (B. altijuga, B. esparzae y B. pontiveteris, todas pertenecientes a la sección Bullockia) se describen como nuevas. Se designa asimismo el lectotipo de B. submoniliformis Engl. y el neotipo de Amiris linanoe La Llave. Se presenta una clave para la identificación de las especies y se proporcionan sus descripciones, sinonimias, ilustraciones y mapas de distribución, además de la información sobre nombres comunes y usos locales, así como la correspondiente a las afinidades ecológicas. Se discuten también brevemente algunos aspectos fitogeográficos. Se incluye por otra parte un resumen histórico del desarrollo del conocimiento taxonómico de Bursera y de sus complejidades nomenclaturales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The upper Papaloapan river basin is defined in this paper as the southwestern part of this hydrologic region situated above the 400 m contour line, thus embracing an area of approximately 21,000 km2, shared between the Mexican states of Oaxaca, Puebla and Veracruz. On the basis of a study of more than 900 collections of Bursera from the region, the existence of 21 species is documented. Two of these (B. graveolens (H.B.K.) Tr. &amp; Planch. and B. hintonii Bullock) were previously unreported from the area. For one species the name B. linanoe (La Llave) comb. nova is proposed as legitimate for the plant known as B. aloexylon (Schiede ex Schltdl.) Engl. Three additional species (B. altijuga, B. esparzae and B. pontiveteris, all belonging to the section Bullockia)) are described as new. A lectotype is also designated for B. submoniliformis Engl., as well as a neotype for Amiris linanoe La Llave. An identification key is provided for all the species, as well as descriptions, synonymy, illustrations, distribution maps and information concerning local names, uses and ecological preferences. A brief phytogeographical discussion is also given. In addition, a summary of the taxonomic history of Bursera, including its nomenclatural complexities, is provided.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Bursera]]></kwd>
<kwd lng="es"><![CDATA[Burseraceae]]></kwd>
<kwd lng="es"><![CDATA[cuenca del Papaloapan]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[Bursera]]></kwd>
<kwd lng="en"><![CDATA[Burseraceae]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="en"><![CDATA[Papaloapan river basin.]]></kwd>
</kwd-group>
</article-meta>
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