Morphological variation of Gentiana section Chondrophyllae in South America and taxonomic implications

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• 作者：Simon Pfanzelt ; Klaus Bernhard von Hagen
• 关键词：Andes ; Gentiana sedifolia ; Hybrid zone ; Morphometrics ; Multivariate analyses
• 刊名：Plant Systematics and Evolution
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：302
• 期：2
• 页码：155-172
• 全文大小：1,227 KB
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• 作者单位：Simon Pfanzelt (1)
  Klaus Bernhard von Hagen (1)
  
  1. Institute of Biology and Environmental Sciences, Carl von Ossietzky University Oldenburg, Carl-von-Ossietzky-Str. 9–11, 26111, Oldenburg, Germany
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Plant Ecology
  Plant Anatomy and Development
  Plant Systematics/Taxonomy/ Biogeography
  
• 出版者：Springer Wien
• ISSN：1615-6110

文摘

Gentiana species and varieties in the Andes of South America are morphologically weakly differentiated and geographical distribution ranges are not known. Here, we recorded 20 morphological characters for 135 individuals of Gentiana from within and outside South America, and observed four additional characters from a large collection of georeferenced flower photographs. To assess geographical patterns and draw taxonomic consequences, the characters were evaluated individually using box plots and histograms, and together using multivariate ordination plots. Our data support the recognition of two species: one in northern South America, G. sedifolia Kunth, and one in southern South America, G. gayi Griseb., which seem to intergrade in southern Bolivia approximately where wet puna converges into dry puna vegetation. Unusually small individuals of the southern lineage occur in the very South (>45°S). We treat them as G. gayi subsp. magellanica (Kusn.) S.Pfanzelt et K.B.Hagen comb. et stat. nov. We found no support for other previously described species or varieties and if they exist they will be of local distribution only. The respective lectotypifications are made. In our preferred scenario, G. sedifolia and G. gayi have colonized South America independently from the northern hemisphere, although this was not unequivocal and both species are closely related. Keywords Andes Gentiana sedifolia Hybrid zone Morphometrics Multivariate analyses