<?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>S1405-27682025000200001</article-id>
<article-id pub-id-type="doi">10.18387/polibotanica.60.1</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Mammillaria scoria (Cactaceae) a new species from Querétaro, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Mammillaria scoria (Cactaceae) una nueva especie de Querétaro, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Zamora]]></surname>
<given-names><![CDATA[Pedro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aquino]]></surname>
<given-names><![CDATA[David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Grupo de Estudio de Cactáceas y Vida Silvestre del Occidente, A. C  ]]></institution>
<addr-line><![CDATA[Comala Colima]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México  Instituto de Biología]]></institution>
<addr-line><![CDATA[Coyoacán Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México  Instituto de Biología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<numero>60</numero>
<fpage>1</fpage>
<lpage>13</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-27682025000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-27682025000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-27682025000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Mammillaria ser. Stylothelae is a well-recognized group in southern Chihuahuan Desert. Some members of this series have been regarded as highly polymorphic species. Recent analyses showed that some populations of those species complex can be accepted as independent species. In this study, we measured, statistically analyzed and compared quantitative and qualitative characters in plants during field work and plants in cultivation to identify a new species of de M. ser. Stylothelae from central Querétaro, Mexico. We compared it with close geographical and morphological species of the series as M. crinita, M. duwei, M. nana, M. painteri, and M. tezontle. The new taxon is distinguished by the globose growth form up to 24 mm tall, with 1-2 (mean=1.7) central spines and 17-21 (mean=18.86) radial spines, presence of fibrous roots, naked axils, and non-arillate seeds. The new species inhabits the xerophytic scrub and grows on basic extrusive igneous rock.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Mammillaria ser. Stylothelae es un grupo bien reconocido en el sur del Desierto Chihuahuense. Algunos miembros de esta serie has sido considerados como especies altamente polimórficas. Análisis recientes mostraron que algunas poblaciones de estos complejos de especies pueden ser aceptadas como especies independientes. En este estudio medimos, analizamos estadísticamente y comparamos caracteres cuantitativos y cualitativos en plantas en el campo y en cultivo, para identificar a una nueva especie de M. ser. Stylothelae del centro de Querétaro, México. Comparamos el nuevo taxón con especies geográfica y morfológicamente cercanas de la serie como M. crinita, M. duwei, M. nana, M. painteri y M. tezontle. El nuevo taxón se distingue por su forma de crecimiento globosa de hasta 24 mm de alto, con 1 a 2 (media=1.7) espinas centrales y 17-21 (media=18.86) espinas radiales, presencia de raíces fibrosas, axilas desnudas y semillas sin arilo. La nueva especie habita el matorral xerófílo creciendo en afloramientos de escoria volcánica.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cacteae]]></kwd>
<kwd lng="en"><![CDATA[Linear Discriminant Analysis]]></kwd>
<kwd lng="en"><![CDATA[Mammillaria ser. Stylothelae]]></kwd>
<kwd lng="en"><![CDATA[morphometrics]]></kwd>
<kwd lng="en"><![CDATA[taxonomy]]></kwd>
<kwd lng="es"><![CDATA[Cacteae]]></kwd>
<kwd lng="es"><![CDATA[Análisis Discriminante Lineal]]></kwd>
<kwd lng="es"><![CDATA[Mammillaria ser. Stylothelae]]></kwd>
<kwd lng="es"><![CDATA[taxonomy]]></kwd>
</kwd-group>
</article-meta>
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