<?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>S0187-71512021000100154</article-id>
<article-id pub-id-type="doi">10.21829/abm128.2021.1846</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Engellaria (Caryophyllaceae), a new North American genus segregated from Stellaria]]></article-title>
<article-title xml:lang="es"><![CDATA[Engellaria (Caryophyllaceae), un nuevo género norteamericano segregado de Stellaria]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Iamonico]]></surname>
<given-names><![CDATA[Duilio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Rome Sapienza Department of Planning, Desing, and Technology of Architecture ]]></institution>
<addr-line><![CDATA[Rome ]]></addr-line>
<country>Italy</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<numero>128</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512021000100154&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512021000100154&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512021000100154&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background and Aims: Stellaria traditionally comprises 150-200 species, mainly distributed in the temperate regions of Eurasia and North America. Molecular studies demonstrated that Stellaria is polyphyletic and includes about 120 species. The genus has a high phenotypic variability which has led to nomenclatural disorders, making the identification of the various species difficult. A note is presented about a taxon currently accepted under the genus Stellaria -Stellaria obtusa- which should be recognized as a separate genus, here proposed as Engellaria gen. nov.  Methods: This study is based on examination of specimens of American and European herbaria and analysis of relevant literature.  Key results:  Available molecular data show that Stellaria obtusa is not included in the Stellaria s.s. clade, but instead is basal to another clade comprising the genera Honckenya, Schiedea, and Wilhelmsia. Stellaria obtusa was, therefore, compared with these three groups and with morphologically similar apetalous members of Stellaria s.s. (S. crispa, S. media, S. pallida, and S. irrigua). The results obtained lead to the recognition of S. obtusa as a separate new North American monotypic genus. A diagnostic key of the apetalous members belonging to the American Caryophyllaceae genera is proposed. Finally, the names Stellaria obtusa and S. washingtoniana (= S. obtusa) are lectotypified based on specimens deposited, respectively, at UC (isolectotypes at GH, NY, and YU) and GH (isolectotypes at BM, CAN, CAS, CS, DOV, F, GH, K, MIN, MSC, NY, US, and VT). For the name Alsine viridula (= S. obtusa) the holotype was found at US (isotypes at CAS, F, GH, NY, OSC, RM, and UC).  Conclusions: Stellaria obtusa does not belong to the genus Stellaria. The present study shows that the combined use of morphological data and phylogenetic analyses helped to clarify the taxonomic position of difficult plant groups, as in Stellaria.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes y Objetivos: Stellaria tradicionalmente incluye 150-200 especies principalmente distribuidas en las regiones templadas de Eurasia y América del Norte. Estudios moleculares mostraron que Stellaria es polifilética e incluye aproximadamente 120 especies. El género tiene una alta variabilidad fenotípica que ha llevado a desórdenes nomenclaturales lo que dificulta la identificación de las diversas especies. Se presenta una nota sobre un taxón actualmente aceptado bajo el género Stellaria -Stellaria obtusa- que debe reconocerse como un género separado, aquí propuesto como Engellaria gen. nov.  Métodos: El trabajo está basado en la revisión de especímenes de herbarios americanos y europeos y en el análisis de la literatura.  Resultados clave:  Datos moleculares disponibles muestran que Stellaria obtusa no está incluida en el clado Stellaria s.s., pero que es basal a otro clado que comprende los géneros Honckenya, Schiedea y Wilhelmsia. Stellaria obtusa, por lo tanto, fue comparada con estos tres grupos y con los miembros apétalos morfológicamente similares de Stellaria s.s. (S. crispa, S. media, S. pallida y S. irrigua). Los resultados obtenidos conducen al reconocimiento de S. obtusa como un nuevo género monotípico norteaméricano separado. Se propone una clave diagnóstica de los miembros apétalos pertenecientes a los géneros americanos de Caryophyllaceae. Finalmente, los nombres Stellaria obtusa y Stellaria washingtoniana (= S. obtusa) se lectotipifican basado en especímenes depositados, respectivamente, en UC (isolectotipos en GH, NY y YU) y GH (isolectotipos en BM, CAN, CAS, CS, DOV, F, GH, K, MIN, MSC, NY, US y VT), respectivamente. Para el nombre Alsine viridula (= S. obtusa) el holotipo se encontró en USA (isotipos en CAS, F, GH, NY, OSC, RM y UC).  Conclusiones: Stellaria obtusa no pertenece al género Stellaria. El presente estudio muestra cómo el uso combinado de datos morfológicos y análisis filogenéticos ayudó a aclarar la posición taxonómica de grupos de plantas difíciles, como Stellaria.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Engellaria obtusa]]></kwd>
<kwd lng="en"><![CDATA[molecular data]]></kwd>
<kwd lng="en"><![CDATA[morphology]]></kwd>
<kwd lng="es"><![CDATA[datos moleculares]]></kwd>
<kwd lng="es"><![CDATA[Engellaria obtusa]]></kwd>
<kwd lng="es"><![CDATA[morfología]]></kwd>
</kwd-group>
</article-meta>
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