Abstract
Lappula Moench includes ca. 70 species and exhibits a wide range of nutlet variation. Currently, the evolutionary relationships among species of Lappula have not been examined; therefore, to elucidate phylogenetic relationships and morphological evolution within Lappula and related genera, we conducted phylogenetic analyses with matrices that include 48 species as well as four DNA regions (ITS, trnL-trnF, rpS16 and psbA-trnH) and 18 morphological characters. These matrices were analyzed using maximum parsimony, maximum likelihood, and Bayesian inference methods. Analyses of the combined molecular and morphological data result in a phylogeny that is better resolved than that based solely on molecular sequence data. Phylogenetic results suggest that the current infrageneric classification of Lappula, at least at the subsectional and series level, is artificial. The evolutionary patterns of 18 morphological characters are investigated in a phylogenetic context. In Lappula, nutlet homomorphism and small corollas are resolved as ancestral, while nutlet heteromorphism and larger corollas are derived.
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Acknowledgments
This research was funded by the CAS Important Direction for Knowledge Innovation Project (KZCX2-EW-305), and Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences. Thanks to Prof. AnRen LI (Institute of Botany, CAS, China) for his helpful identification to our field samples, to Dr. Stewart C. Sanderson (Shrub Sciences Laboratory, USDA, Utah, USA) for his offering of the American Lappula materials. Thanks specially to anonymous reviewers for their valuable and constructive suggestions.
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Huang, JF., Zhang, ML. & Cohen, J.I. Phylogenetic analysis of Lappula Moench (Boraginaceae) based on molecular and morphological data. Plant Syst Evol 299, 913–926 (2013). https://doi.org/10.1007/s00606-013-0772-3
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DOI: https://doi.org/10.1007/s00606-013-0772-3