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TAXON

Plant Diversity and Resources

Journal of Systematics and Evolution

Volume 55 Issue 5, Pages 446C452.

Published Online: 26 Apr. 2017

DOI: 10.1111/jse.12249

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Systematic position of Oreosolen (tribe Scrophularieae, Scrophulariaceae) based on nuclear and plastid sequences

Chuan Chen1,2, Min-Qi Cai1, Bo Xu3, Xin-Jie Jin1, Rui-Hong Wang4*, Pan Li1*, Yun-Peng Zhao1, and Cheng-Xin Fu1

1Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education, and Laboratory of Systematic and Evolutionary Botany and Biodiversity, College of Life Sciences, Zhejiang University, Hangzhou 310058, China

2Hangzhou Botanical Garden (Hangzhou Research Institute of Garden Science), Hangzhou 310013, China

3College of Forestry, Southwest Forestry University, Kunming 650204, China

4Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou 310018, China

Keywords: alpine plants; convergent evolution; new combination and synonym; Oreosolen; phylogeny; Scrophularia

Abstract:

The genera Oreosolen and Scrophularia (Scrophulariaceae) were assumed to be closely related due to the considerable similarity in morphology. Their sister relationship was even suggested in a few molecular phylogenetic studies. However, this proposed relationship is not so convincing due to insufficient sampling ofScrophularia. In this study, the systematic position of Oreosolen was reassessed based on more sampling of both taxa and molecular traits. A total of 104 accessions representing 89 taxa were sampled, including 87 (85 taxa) of Scrophularia, 14 (one taxon) of Oreosolen, and three outgroups. The phylogenetic relationships between Oreosolen and Scrophularia were inferred based on one nuclear (internal transcribed spacer) and three plastid (trnL-F, psbA-trnH, and trnQ-rps16) DNA regions using maximum parsimony, maximum likelihood, and Bayesian inference methods. The results revealed that Oreosolen was nested withinScrophularia and thus its generic status was not supported. Its type species, Oreosolen wattii Hook. f., was then transferred to Scrophularia and a new combination (Scrophularia wattii (Hook. f.) P. Li) was proposed. Oreosolen and its sympatric ally, Phlomoides rotata (Benth. ex Hook. f.) Mathiesen (= Lamiophlomis rotata (Benth. ex Hook. f.) Kudô, Lamiaceae), might undergo convergent evolution of acaulescence and rosulate leaves driven by the harsh alpine environment.

 

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