<?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>S0187-71512019000100120</article-id>
<article-id pub-id-type="doi">10.21829/abm126.2019.1435</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Pollen viability and germinability of putative Bursera hybrids (section Bullockia; Burseraceae) in Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Viabilidad y germinación de polen en probables híbridos de Bursera (sección Bullockia; Burseraceae) en México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rico]]></surname>
<given-names><![CDATA[Yessica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-Estanislao]]></surname>
<given-names><![CDATA[Leticia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Ecología  ]]></institution>
<addr-line><![CDATA[Pátzcuaro Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico Superior de Pátzcuaro  ]]></institution>
<addr-line><![CDATA[Pátzcuaro Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<numero>126</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512019000100120&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512019000100120&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512019000100120&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background and Aims:  The genus Bursera (~100 species) has its center of diversification and endemism in Mexico. Interspecific hybridization is a frequent phenomenon in Bursera in areas where related species coexist. Hybridization on the one hand can reinforce reproductive barriers, increase genetic variation, generate novel ecotypes and new lineages, and on the other hand, can lead to maladaptation. However, the ecological and evolutionary consequences of natural hybridization critically depend on hybrid fitness. In this study, within a putative hybrid population in the tropical dry forest of the Bajío region in Mexico and as a proxy of hybrid fitness, we investigated pollen viability among Bursera cuneata, B. bipinnata, and their putative hybrid.  Methods: We used two techniques: a pollen staining test with tetrazolium chloride 1% and an in vitro germination test to observe the formation of pollen tubes. Viability percentages were calculated for each group; statistical tests were conducted with general linear models.  Key results: Results demonstrated that the putative hybrid is not sterile and exhibited higher germination rates relative to the parental species.  Conclusions: Our results imply that gene flow between the parental species and the putative hybrid is likely to occur. Future genetic studies should confirm the genetic identity and ploidy levels of hybrids and evaluate whether genetic introgression has occurred. Our study demonstrates that Bursera hybrids can be fertile and contributes towards understanding the role of hybridization and reproductive isolation in Mexican Bursera species.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes y Objetivos:  El género Bursera (~100 especies) tiene su centro de diversificación y endemismo en México. La hibridación interespecífica es un fenómeno común en Bursera en áreas donde coexisten especies relacionadas. La hibridación, por un lado, puede reforzar las barreras reproductivas, aumentar la variación genética, generar ecotipos novedosos y nuevos linajes y, por otro lado, puede conducir a una mala adaptación. Sin embargo, las consecuencias ecológicas y evolutivas de la hibridación natural dependen críticamente de la aptitud de los híbridos. En este estudio, dentro de una población de posibles híbridos en el bosque tropical seco de la región del Bajío en México y utilizando una aproximación de aptitud híbrida, investigamos la viabilidad del polen entre Bursera cuneata, B. bipinnata, y su respectivo híbrido hipotético.  Métodos:  Utilizamos dos técnicas: una prueba de tinción de polen con cloruro de tetrazolio 1% y una prueba de germinación in vitro para observar la formación de tubos de polen. Se calcularon porcentajes de viabilidad para cada grupo; las pruebas estadísticas se realizaron con modelos lineales generales.  Resultados clave:  Los resultados demuestran que el híbrido hipotético no es estéril y que presenta mayores tasas de germinación en comparación con las especies parentales.  Conclusiones:  Nuestros resultados sugieren que el flujo genético entre las especies parentales y el híbrido hipotético es probable. Futuros estudios genéticos deben confirmar el origen genético y nivel de poliploidía de los híbridos y determinar si existe introgresión genética. Nuestro estudio demuestra que los híbridos de Bursera pueden ser fértiles, por lo que contribuye a comprender el papel de la hibridación y el aislamiento reproductivo en las especies mexicanas de Bursera.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[copales]]></kwd>
<kwd lng="en"><![CDATA[hybrid fertility]]></kwd>
<kwd lng="en"><![CDATA[hybrid zone]]></kwd>
<kwd lng="en"><![CDATA[in vitro germination]]></kwd>
<kwd lng="en"><![CDATA[staining method]]></kwd>
<kwd lng="en"><![CDATA[tropical dry forest]]></kwd>
<kwd lng="es"><![CDATA[bosque tropical caducifolio]]></kwd>
<kwd lng="es"><![CDATA[copales]]></kwd>
<kwd lng="es"><![CDATA[fertilidad en híbridos]]></kwd>
<kwd lng="es"><![CDATA[germinación in vitro]]></kwd>
<kwd lng="es"><![CDATA[técnica de tinción]]></kwd>
<kwd lng="es"><![CDATA[zonas de hibridación]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Abbott]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Albach]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Ansell]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Arntzen]]></surname>
<given-names><![CDATA[J. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Baird]]></surname>
<given-names><![CDATA[S. J. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Bierne]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Boughman]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Brelsford]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Buerkle]]></surname>
<given-names><![CDATA[C. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Buggs]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Butlin]]></surname>
<given-names><![CDATA[R. K.]]></given-names>
</name>
<name>
<surname><![CDATA[Dieckmann]]></surname>
<given-names><![CDATA[U.]]></given-names>
</name>
<name>
<surname><![CDATA[Eroukhmanoff]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Grill]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Cahan]]></surname>
<given-names><![CDATA[S. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Hermansen]]></surname>
<given-names><![CDATA[J. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Hewitt]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Hudson]]></surname>
<given-names><![CDATA[A. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Jiggins]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Jones]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Keller]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Marczewski]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Mallet]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Martinez-Rodriguez]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Möst]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Mullen]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Nichols]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Nolte]]></surname>
<given-names><![CDATA[A. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Parisod]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Pfennig]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Rice]]></surname>
<given-names><![CDATA[A. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Ritchie]]></surname>
<given-names><![CDATA[M. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Seifert]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Smadja]]></surname>
<given-names><![CDATA[C. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Stelkens]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Szymura]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Väinölä]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Wolf]]></surname>
<given-names><![CDATA[J. B. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Zinner]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Hybridization and speciation]]></article-title>
<source><![CDATA[Journal of Evolutionary Biology]]></source>
<year>2013</year>
<volume>26</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>229-46</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Abdelgadir]]></surname>
<given-names><![CDATA[H. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Johnson]]></surname>
<given-names><![CDATA[S. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Staden]]></surname>
<given-names><![CDATA[J. Van]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Pollen viability, pollen germination and pollen tube growth in the biofuel seed crop Jatropha curcas (Euphorbiaceae)]]></article-title>
<source><![CDATA[South African Journal of Botany]]></source>
<year>2012</year>
<volume>79</volume>
<page-range>132-9</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Alix]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Gérard]]></surname>
<given-names><![CDATA[P. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Schwarzacher]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Heslop-Harrison]]></surname>
<given-names><![CDATA[J. S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Polyploidy and interspecific hybridization: partners for adaptation, speciation and evolution in plants]]></article-title>
<source><![CDATA[Annals of Botany]]></source>
<year>2017</year>
<volume>120</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>183-94</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Baack]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Melo]]></surname>
<given-names><![CDATA[M. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Rieseberg]]></surname>
<given-names><![CDATA[L. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Ortiz-Barrientos]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The origins of reproductive isolation in plants]]></article-title>
<source><![CDATA[New Phytologist]]></source>
<year>2015</year>
<volume>207</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>968-84</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Barker]]></surname>
<given-names><![CDATA[M. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Arrigo]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Baniaga]]></surname>
<given-names><![CDATA[A. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Levin]]></surname>
<given-names><![CDATA[D. A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[On the relative abundance of autopolyploids and allopolyploids]]></article-title>
<source><![CDATA[New Phytologist]]></source>
<year>2016</year>
<volume>210</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>391-8</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Birchler]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Yao]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Chudalayandi]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Unraveling the genetic basis of hybrid vigor]]></article-title>
<source><![CDATA[Proceedings of the National Academy of Sciences of the United States of America]]></source>
<year>2006</year>
<volume>103</volume>
<numero>35</numero>
<issue>35</issue>
<page-range>12957-8</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bonfil-Sanders]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Cajero-Lázaro]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Evans]]></surname>
<given-names><![CDATA[R. Y.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Germinación de semillas de seis especies de Bursera del centro de México]]></article-title>
<source><![CDATA[Agrociencia]]></source>
<year>2008</year>
<volume>42</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>827-34</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bures]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Smarda]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Rotreklova]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Oberreiter]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Buresova]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Knoll]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Fajmon]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Smerda]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Pollen viability and natural hybridization of Central European species of Cirsium]]></article-title>
<source><![CDATA[Preslia]]></source>
<year>2010</year>
<volume>82</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>391-422</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Campbell]]></surname>
<given-names><![CDATA[D. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Alarcon]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[C. A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Reproductive isolation and hybrid pollen disadvantage in Ipomopsis]]></article-title>
<source><![CDATA[Journal of Evolutionary Biology]]></source>
<year>2003</year>
<volume>16</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>536-40</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cortes-Palomec]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Biología reproductiva de Bursera medranoana Rzedowski &amp; Ortiz (Burseraceae). Una especie de origen híbrido]]></source>
<year>1998</year>
<page-range>59</page-range><publisher-loc><![CDATA[D.F., México ]]></publisher-loc>
<publisher-name><![CDATA[Facultad de Ciencias, Universidad Nacional Autonoma de México]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[De Almeida-Vieira]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Appolinario]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Gouvea-Fajardo]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[De-Carvalho]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Reproductive biology of Protium spruceanum (Burseraceae), a dominant dioecious tree in vegetation corridors in Southeastern Brazil]]></article-title>
<source><![CDATA[Revista Brasileira de Botânica]]></source>
<year>2010</year>
<volume>33</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>711-5</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Franssen]]></surname>
<given-names><![CDATA[A. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Skinner]]></surname>
<given-names><![CDATA[D. Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Al-Khatib]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Horak]]></surname>
<given-names><![CDATA[M. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Pollen morphological differences in Amaranthus species and interspecific hybrids]]></article-title>
<source><![CDATA[Weed Science]]></source>
<year>2001</year>
<volume>49</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>732-7</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Rivero]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Droppelmann]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Descripción morfológica y viabilidad del polen de Nothofagus nervosa (Nothofagaceae)]]></article-title>
<source><![CDATA[BOSQUE]]></source>
<year>2015</year>
<volume>36</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>487-96</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hernández-Oria]]></surname>
<given-names><![CDATA[J. G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Desaparición del bosque seco en el Bajío mexicano: implicaciones del ensamblaje de especies y grupos funcionales en la dinámica de una vegetación amenazada]]></article-title>
<source><![CDATA[Zonas Áridas]]></source>
<year>2007</year>
<volume>11</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>13-31</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hernández-Téllez]]></surname>
<given-names><![CDATA[I. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Viabilidad y germinación de diez especies del género Bursera]]></source>
<year>2015</year>
<page-range>72</page-range><publisher-loc><![CDATA[D.F., México ]]></publisher-loc>
<publisher-name><![CDATA[Facultad de Ciencias, Universidad Nacional Autónoma de México]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hossain]]></surname>
<given-names><![CDATA[M. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Inden]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Asahira]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Pollen morphology of interspecific hybrids of Brassica oleracea and B. campestris]]></article-title>
<source><![CDATA[HORTSCIENCE]]></source>
<year>1990</year>
<volume>25</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>109-11</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ilgin]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Ergenoglu]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Caglar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Viability, germination and amount of pollen in selected caprifig types]]></article-title>
<source><![CDATA[Pakistan Journal of Botany]]></source>
<year>2007</year>
<volume>39</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>9-14</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Karlsdóttir]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Hallsdóttir]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Thórsson]]></surname>
<given-names><![CDATA[A. T.]]></given-names>
</name>
<name>
<surname><![CDATA[Anamthawat-Jónsson]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Characteristics of pollen from natural triploid Betula hybrids]]></article-title>
<source><![CDATA[Grana]]></source>
<year>2008</year>
<volume>47</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>52-9</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[La Porta]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Roselli]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Relationship between pollen germination in vitro and fluorochromatic reaction in cherry clone F12/1 (Prunus avium L.) and some of its mutants]]></article-title>
<source><![CDATA[Journal Horticultural Science and Biotechnology]]></source>
<year>1991</year>
<volume>66</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>171-5</page-range></nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lazarevi&#263;]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Siljak-Yakovlev]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Lazarevi&#263;]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Stevanovi&#263;]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Stevanovi&#263;]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Pollen and seed morphology of resurrection plants from the genus Ramonda (Gesneriaceae): relationship with ploidy level and relevance to their ecology and identification]]></article-title>
<source><![CDATA[Turkish Journal of Botany]]></source>
<year>2013</year>
<volume>37</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>872-85</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Leila-Soares]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Jesus]]></surname>
<given-names><![CDATA[O. De Nunes]]></given-names>
</name>
<name>
<surname><![CDATA[Almeida Dos Santos-Serejo]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Oliveira]]></surname>
<given-names><![CDATA[E. De Jorge]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[In vitro pollen germination and pollen viability in passion fruit (Passiflora spp.)]]></article-title>
<source><![CDATA[Revista Brasileira de Fruticultura]]></source>
<year>2013</year>
<volume>35</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>1116-26</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lenth]]></surname>
<given-names><![CDATA[R. V.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Least-Squares Means: The R Package lsmeans]]></article-title>
<source><![CDATA[Journal of Statistical Software]]></source>
<year>2016</year>
<volume>69</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>1-33</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lowry]]></surname>
<given-names><![CDATA[D. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Modliszewski]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Wright]]></surname>
<given-names><![CDATA[K. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[C. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Willis]]></surname>
<given-names><![CDATA[J. H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The strength and genetic basis of reproductive isolating barriers in flowering plants]]></article-title>
<source><![CDATA[Philosophical Transactions of the Royal Society of London]]></source>
<year>2008</year>
<volume>363</volume>
<numero>1506</numero>
<issue>1506</issue>
<page-range>3009-21</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Marques]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Feliner]]></surname>
<given-names><![CDATA[G. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Ameíia]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Louçaõ]]></surname>
<given-names><![CDATA[M.-L.]]></given-names>
</name>
<name>
<surname><![CDATA[Aguilar]]></surname>
<given-names><![CDATA[J. F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Fitness in Narcissus hybrids: low fertility is overcome by early hybrid vigour, absence of exogenous selection and high bulb propagation]]></article-title>
<source><![CDATA[Journal of Ecology]]></source>
<year>2011</year>
<volume>99</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>1508-19</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[McVaugh]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Rzedowski]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Synopsis of the genus Bursera L in western Mexico, with notes on the material of Bursera collected by Sessé and Mociño]]></article-title>
<source><![CDATA[Kew Bulletin]]></source>
<year>1965</year>
<volume>18</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>317-46</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Miranda]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Hernández-X]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Los tipos de vegetación en México y su clasificación]]></article-title>
<source><![CDATA[Boletín de la Sociedad Botánica de México]]></source>
<year>1963</year>
<volume>28</volume>
<page-range>29-179</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Norton]]></surname>
<given-names><![CDATA[J. D.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Testing of plum pollen viability with tetrazolium salts]]></article-title>
<source><![CDATA[Proceedings of the American Society for Horticultural Science]]></source>
<year>1966</year>
<volume>89</volume>
<page-range>132-4</page-range></nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Nybom]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Pollen viability assessments in blackberries (Rubus subgen. Rubus)]]></article-title>
<source><![CDATA[Plant Systematics and Evolution]]></source>
<year>1985</year>
<volume>150</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>281-90</page-range></nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Osabe]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Kawanabe]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Sasaki]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Ishikawa]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Okazaki]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Dennis]]></surname>
<given-names><![CDATA[E. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Kazama]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Fujimoto]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Multiple mechanisms and challenges for the application of allopolyploidy in plants]]></article-title>
<source><![CDATA[International Journal of Molecular Sciences]]></source>
<year>2012</year>
<volume>13</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>8696-721</page-range></nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pérez-Navarro]]></surname>
<given-names><![CDATA[J. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[El género Bursera Jacq. ex L. (Burseraceae) en la Península de Baja California]]></source>
<year>2001</year>
<page-range>110</page-range><publisher-loc><![CDATA[La Paz, Baja California, México ]]></publisher-loc>
<publisher-name><![CDATA[Centro de Investigaciones Biológicas del Noroeste]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pfennig]]></surname>
<given-names><![CDATA[K. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Kelly]]></surname>
<given-names><![CDATA[A. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Pierce]]></surname>
<given-names><![CDATA[A. A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Hybridization as a facilitator of species range expansion]]></article-title>
<source><![CDATA[Proceedings Biological Sciences]]></source>
<year>2016</year>
<volume>283</volume>
<numero>1839</numero>
<issue>1839</issue>
</nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Quesada]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Fuchs]]></surname>
<given-names><![CDATA[E. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Lobo]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Pollen load size, reproductive success, and progeny kinship of naturally pollinated flowers of the tropical dry forest tree Pachira quinata (Bombacaceae)]]></article-title>
<source><![CDATA[American Journal of Botany]]></source>
<year>2001</year>
<volume>88</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>2113-8</page-range></nlm-citation>
</ref>
<ref id="B33">
<nlm-citation citation-type="book">
<collab>R Core Team</collab>
<source><![CDATA[R: A Language and Environment for Statistical Computing]]></source>
<year>2018</year>
<publisher-loc><![CDATA[R Foundation for Statistical Computing ]]></publisher-loc>
<publisher-name><![CDATA[Vienna, Austria]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B34">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ramos-Ordoñez]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Arizmendi]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Parthenocarpy, attractiveness and seed predation by birds in Bursera morelensis]]></article-title>
<source><![CDATA[Journal of Arid Environments]]></source>
<year>2011</year>
<volume>75</volume>
<numero>9</numero>
<issue>9</issue>
<page-range>757-62</page-range></nlm-citation>
</ref>
<ref id="B35">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rzedowski]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Ortiz]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estudios quimiotaxonómicos de Bursera (Burseraceae). II. Una especie nueva de origen hibrido de la Barranca de Tolantongo, estado de Hidalgo]]></article-title>
<source><![CDATA[Acta Botanica Mexicana]]></source>
<year>1988</year>
<volume>1</volume>
<numero>11-19</numero>
<issue>11-19</issue>
</nlm-citation>
</ref>
<ref id="B36">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rzedowski]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Guevara-Féfer]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Burseraceae]]></article-title>
<source><![CDATA[Flora del Bajío y de regiones adyacentes]]></source>
<year>1992</year>
<volume>3</volume>
<page-range>1-46</page-range></nlm-citation>
</ref>
<ref id="B37">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rzedowski]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Kruse]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Algunas tendencias evolutivas en Bursera (Burseraceae)]]></article-title>
<source><![CDATA[Taxon]]></source>
<year>1979</year>
<volume>28</volume>
<numero>1-3</numero>
<issue>1-3</issue>
<page-range>103-16</page-range></nlm-citation>
</ref>
<ref id="B38">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Scorza]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Sherman]]></surname>
<given-names><![CDATA[W. B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Peaches]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Janik]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Moore]]></surname>
<given-names><![CDATA[J. N.]]></given-names>
</name>
</person-group>
<source><![CDATA[Fruit breeding]]></source>
<year>1995</year>
<page-range>325-440</page-range><publisher-loc><![CDATA[New York, USA ]]></publisher-loc>
<publisher-name><![CDATA[John &amp; Sons]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B39">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sulusoglu]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Cavusoglu]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[In vitro pollen viability and pollen germination in cherry laurel (Prunus laurocerasus L.)]]></article-title>
<source><![CDATA[The Scientific World Journal]]></source>
<year>2014</year>
<volume>2014</volume>
</nlm-citation>
</ref>
<ref id="B40">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Todesco]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Pascual]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Owens]]></surname>
<given-names><![CDATA[G. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Ostevik]]></surname>
<given-names><![CDATA[K. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Moyers]]></surname>
<given-names><![CDATA[B. T.]]></given-names>
</name>
<name>
<surname><![CDATA[Hübner]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Heredia]]></surname>
<given-names><![CDATA[S. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Hahn]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Caseys]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Bock]]></surname>
<given-names><![CDATA[D. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Rieseberg]]></surname>
<given-names><![CDATA[L. H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Hybridization and extinction]]></article-title>
<source><![CDATA[Evolutionary Applications]]></source>
<year>2016</year>
<volume>9</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>892-908</page-range></nlm-citation>
</ref>
<ref id="B41">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Toledo-Manzur]]></surname>
<given-names><![CDATA[C. A.]]></given-names>
</name>
</person-group>
<source><![CDATA[El género Bursera (Burseraceae) en el estado de Guerrero (Mexico)]]></source>
<year>1982</year>
<page-range>364</page-range><publisher-loc><![CDATA[D.F., México ]]></publisher-loc>
<publisher-name><![CDATA[Facultad de Ciencias, Universidad Nacional Autónoma de Mexico]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B42">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Weeks]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Simpson]]></surname>
<given-names><![CDATA[B. B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Molecular genetic evidence for interspecific hybridization among endemic Hispaniolan Bursera (Burseraceae)]]></article-title>
<source><![CDATA[American Journal of Botany]]></source>
<year>2004</year>
<volume>91</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>976-84</page-range></nlm-citation>
</ref>
<ref id="B43">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Whitham]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Morrow]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Potts]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Conservation of hybrid plants]]></article-title>
<source><![CDATA[Science]]></source>
<year>1991</year>
<volume>254</volume>
<numero>5033</numero>
<issue>5033</issue>
<page-range>779-80</page-range></nlm-citation>
</ref>
<ref id="B44">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Widmer]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Lexer]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Cozzolino]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Evolution of reproductive isolation in plants]]></article-title>
<source><![CDATA[Heredity]]></source>
<year>2009</year>
<volume>102</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>31-8</page-range></nlm-citation>
</ref>
<ref id="B45">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wro&#324;ska-Pilarek]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Bocianowski]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Jagodzi&#324;ski]]></surname>
<given-names><![CDATA[A. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Comparison of pollen grain morphological features of selected species of the genus Crataegus (Rosaceae) and their spontaneous hybrids]]></article-title>
<source><![CDATA[Botanical Journal of the Linnean Society]]></source>
<year>2013</year>
<volume>172</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>555-71</page-range></nlm-citation>
</ref>
<ref id="B46">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wro&#324;ska-Pilarek]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Danielewicz]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Bocianowski]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Mali&#324;ski]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Janyszek]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Comparative Pollen Morphological Analysis and Its Systematic Implications on Three European Oak (Quercus L., Fagaceae) Species and their spontaneous hybrids]]></article-title>
<source><![CDATA[PloS ONE]]></source>
<year>2016</year>
<volume>11</volume>
<numero>8</numero>
<issue>8</issue>
</nlm-citation>
</ref>
<ref id="B47">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Xie]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhu]]></surname>
<given-names><![CDATA[X.]]></given-names>
</name>
<name>
<surname><![CDATA[Ma]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhao]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[Q.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Natural hybridization and reproductive isolation between two Primula species]]></article-title>
<source><![CDATA[Journal of Integrative Plant Biology]]></source>
<year>2017</year>
<volume>59</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>526-30</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
