<?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>S1405-27682005000100001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[VARIACIÓN MORFOANATÓMICA EN UNA POBLACIÓN DE SENECIO FILAGINOIDES (ASTERACEAE)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Feijóo]]></surname>
<given-names><![CDATA[M. S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arce]]></surname>
<given-names><![CDATA[M. E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[D&#8216;Ambrogio]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de la Patagonia San Juan Bosco Facultad de Ciencias Naturales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Buenos Aires Facultad de Agronomía ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Argentina</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>19</numero>
<fpage>1</fpage>
<lpage>17</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-27682005000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-27682005000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-27682005000100001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN S. filaginoides DC "charcao, mata mora", es un arbusto albo-tomentoso, ampliamente distribuido en las regiones áridas de Argentina, característico de la provincia patagónica. Presenta dos variedades S. filaginoides var. filaginoides y S. filaginoides var. lobulatus (Hook. et Arn.) Cabrera. Se estudiaron caracteres morfoanatómicos de las variedades y las estructuras secretoras de aceites esenciales en las estaciones del año. La longitud de la hoja adulta es significativamente mayor en la variedad filaginoides para todas las estaciones del año. La proporción de área ocupada por las estructuras secretoras es más amplia en la lámina foliar que en el tallo para las dos variedades y mayor en invierno para ambos órganos. La variedad lobulatus presenta en el tallo mayor número y diámetro de canales esquizógenos, y gran número de células secretoras. La densidad del indumento disminuye con la madurez de las hojas y la pilosidad se reduce por pérdida de la célula apical de los tricomas no glandulares.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Morphoanatomical variation in a Senecio filaginoides (Asteraceae) population. S. filaginoides DC "charcao, mata mora", is a white-tomentose shrub widely distributed in arid region of Argentine, characteristic of Patagonia province. It has two varieties, S. filaginoides var. filaginoides y S. filaginoides var. lobulatus (Hook. et Arn.) Cabrera. Morphoanatomical characters and essential oil secretory structures were studied in year seasons. The length of grown up leaf is significatively larger in filaginoides variety for all the seasons. The proportion of area occupied by secretory structures is bigger in the foliar sheet than in the stem for the two varieties. It is bigger in winter for both organs. Schizogenous ducts are larger in number and diameter in the stem of lobulatus variety. Secretory cell&#8217;s number is larger, too. The indumentum density decreases with leaf maturity and pilosity reduces by lost of no glandular trichomes apical cell.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Senecio filaginoides]]></kwd>
<kwd lng="es"><![CDATA[Asteraceae]]></kwd>
<kwd lng="es"><![CDATA[morfología]]></kwd>
<kwd lng="es"><![CDATA[anatomía]]></kwd>
<kwd lng="es"><![CDATA[Patagonia]]></kwd>
<kwd lng="en"><![CDATA[Senecio filaginoides]]></kwd>
<kwd lng="en"><![CDATA[Asteraceae]]></kwd>
<kwd lng="en"><![CDATA[morphology]]></kwd>
<kwd lng="en"><![CDATA[anatomy]]></kwd>
<kwd lng="en"><![CDATA[Patagonia]]></kwd>
</kwd-group>
</article-meta>
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