<?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>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982023000200608</article-id>
<article-id pub-id-type="doi">10.17129/botsci.3216</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Ruehssia magalloniae (Apocynaceae; Asclepiadoideae), una especie nueva del bosque mesófilo de montaña de la Sierra Norte de Oaxaca, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Ruehssia magalloniae (Apocynaceae), a new species from the cloud forest of the Sierra Norte of Oaxaca, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarado-Cárdenas]]></surname>
<given-names><![CDATA[Leonardo O.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Mendoza]]></surname>
<given-names><![CDATA[Abisaí Josué]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sandoval-Gutiérrez]]></surname>
<given-names><![CDATA[Daniel]]></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 Laboratorio de Plantas Vasculares]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Biología Jardín Botánico]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<volume>101</volume>
<numero>2</numero>
<fpage>608</fpage>
<lpage>618</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982023000200608&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982023000200608&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982023000200608&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: Como parte de las colectas para inventariar la Flora de Oaxaca, se realizó una exploración en el bosque mesófilo de montaña de la Sierra Norte del estado, encontrándose una planta trepadora del género Ruehssia, que no coincidía con las demás especies del género.  Preguntas:  ¿La morfología de la corola, de la corona ginostegial y del fruto, así como la distribución geográfica, serán elementos suficientes que permitan distinguir especies en el género Ruehssia?  Especies de estudio: Ruehssia sp. nov.  Sitio y años de estudio: Sierra Norte de Oaxaca, México; 1989-2022.  Métodos: A partir del material colectado y de herbario, se analizó la morfología y distribución de las poblaciones de la especie y se comparó con taxones afines. Conforme a los criterios de la IUCN se estableció una categoría de vulnerabilidad para la especie.  Resultados:  Aquí se propone una especie nueva con base en el concepto cohesivo de especie. La especie es similar a Ruehssia rzedowskiana y R. calichicola, pero difiere en la morfología de la corola y la corona ginostegial, así como en su distribución. Se proporciona la descripción morfológica de la especie nueva, imágenes de los taxones tratados, un mapa de distribución geográfica y el estado de conservación. Se incluye una clave de las 18 especies de Ruehssia presentes en Oaxaca.  Conclusiones: Ruehssia magalloniae se reconoce como una especie nueva para la ciencia. Este descubrimiento incrementa a 39 el número de especies de Ruehssia registradas para México, con un 58 % de endemismo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: As part of an expedition to checklist the Flora of Oaxaca, a fieldtrip was carried out in the cloud mountain forest of the &#8216;Sierra Norte&#8217;, during which there was a climbing plant found of the genus Ruehssia that differs of any other species in the genus.  Questions: The morphology of the corolla, the gynostegial corona and the fruit, as well as the geographical distribution are all elements that provide a basis for distinguishing between species of Ruehssia. Here we propose a new species on the grounds of the cohesive concept of species.  Studied species: Ruehssia sp. nov.  Study site and dates: Sierra Norte de Oaxaca, México; 1989-2022.  Methods: An analysis of the morphology and distribution of the populations of the species in question and related taxa was conducted using the collected specimens and herbarium material. In respect to the IUCN criteria, a vulnerability category was established for the species.  Results: The species is similar to Ruehssia rzedowskiana and R. calichicola, but there is a morphological difference regarding the corolla, the gynostegial corona, and its distribution. A morphological description of the new species is provided, in addition to images of the revised taxa, and a map of its geographical distribution and state of conservation. A key to the 18 species of Ruehssia in Oaxaca is also included.  Conclusions: Ruehssia magalloniae is recognised as a new species in science. This discovery increases the number of species of Ruehssia listed in Mexico to 39 with a 58 % of endemism.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[estado de conservación]]></kwd>
<kwd lng="es"><![CDATA[endemismo]]></kwd>
<kwd lng="es"><![CDATA[Flora de Oaxaca]]></kwd>
<kwd lng="es"><![CDATA[Marsdenia]]></kwd>
<kwd lng="es"><![CDATA[IUCN]]></kwd>
<kwd lng="en"><![CDATA[conservation status]]></kwd>
<kwd lng="en"><![CDATA[endemism]]></kwd>
<kwd lng="en"><![CDATA[Flora of Oaxaca]]></kwd>
<kwd lng="en"><![CDATA[Marsdenia]]></kwd>
<kwd lng="en"><![CDATA[IUCN]]></kwd>
</kwd-group>
</article-meta>
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