Abstract
The familial placement of Wightia has long been a problem. Here, we present a comprehensive phylogenetic inspection of Wightia based on noncoding chloroplast loci (the rps16 intron and the trnL–F region) and nuclear ribosomal internal transcribed spacer, and on chemical analysis. A total of 70 samples (including 51 genera from 13 families of Lamiales) were employed in a molecular study. Phylograms suggest that Wightia is sister to Paulownia or Phrymaceae; species tree shows Wightia and Paulownia are sister groups which clustered with Phrymaceae in an unresolved clade. Chemical evidence shows affinity of Wightia to Paulowniaceae. With the addition of morphological, palynological and ecological characters, we suppose a familial position of Wightia belonging to or close to Paulowniaceae. Brandisia (a member of Orobanchaceae) does not have a close relationship with Wightia.
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Acknowledgments
We thank Jie Liu and Li–Na Dong (Kunming Institute of Botany, Chinese Academy of Sciences), You-Fang Wang, Ying-Ying Wang and Shen-Zhan Xiong (East China Normal University), and Zheng-Wei Wang and Bin-Jie Ge (Shanghai Chenshan Botanical Garden) for collecting specimens. We also thank the staff of the Royal Botanic Gardens Kew, England, for growing and providing the material of Hemichaena fruticosa. Our study was funded by the National Natural Science Foundation of China (Grant No. 31270242) and the Shanghai Natural Science Foundation (Grant No. 10ZR1408600).
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Zhou, QM., Jensen, S.R., Liu, GL. et al. Familial placement of Wightia (Lamiales). Plant Syst Evol 300, 2009–2017 (2014). https://doi.org/10.1007/s00606-014-1029-5
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DOI: https://doi.org/10.1007/s00606-014-1029-5