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Phylogeny of Impatiens (Balsaminaceae) : integrating molecular and morphological evidence into a new classification
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- Yu, Sheng-Xiang (author)
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, the Chinese Academy of Sciences, Beijing, 100093, China
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- Janssens, Steven B. (author)
- Botanic Garden Meise, Nieuwelaan 38, Meise, BE-1860, Belgium
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- Zhu, Xiang-Yun (author)
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, the Chinese Academy of Sciences, Beijing, 100093, China
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- (creator_code:org_t)
- 2015-03-11
- 2016
- English.
- In: Cladistics. - : Wiley-Blackwell. - 0748-3007 .- 1096-0031. ; 32:2, s. 179-197
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Impatiens L. is one of the largest angiosperm genera, containing over 1000 species, and is notorious for its taxonomic difficulty. Here, we present, to our knowledge, the most comprehensive phylogenetic analysis of the genus to date based on a total evidence approach. Forty-six morphological characters, mainly obtained from our own investigations, are combined with sequence data from three genetic regions, including nuclear ribosomal ITS and plastid atpB-rbcL and trnL-F. We include 150 Impatiens species representing all clades recovered by previous phylogenetic analyses as well as three outgroups. Maximum-parsimony and Bayesian inference methods were used to infer phylogenetic relationships. Our analyses concur with previous studies, but in most cases provide stronger support. Impatiens splits into two major clades. For the first time, we report that species with three-colpate pollen and four carpels form a monophyletic group (clade I). Within clade II, seven well-supported subclades are recognized. Within this phylogenetic framework, character evolution is reconstructed, and diagnostic morphological characters for different clades and subclades are identified and discussed. Based on both morphological and molecular evidence, a new classification outline is presented, in which Impatiens is divided into two subgenera, subgen. Clavicarpa and subgen. Impatiens; the latter is further subdivided into seven sections.
Subject headings
- NATURVETENSKAP -- Biologi -- Botanik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Botany (hsv//eng)
Keyword
- Biologi med inriktning mot systematik
- Biology with specialization in Systematics
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- ref (subject category)
- art (subject category)
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- Uppsala University
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