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Open AccessArticle

A Narrow Endemic or a Species Showing Disjunct Distribution? Studies on Meehania montis-koyae Ohwi (Lamiaceae)

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Museum of Nature and Human Activities, Hyogo. 6 Chome, Yayoigaoka, Sanda, Hyogo 669-1546, Japan
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Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, Japan
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College of Life Sciences, Zhejiang University, 866 Yuhangtang Rd., Xihu District, Hangzhou 310058, China
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Tohoku University, Kawatabi Field Science Center, Graduate School of Agricultural Science, 232-3 Yomogida, Naruko-onsen, Osaki, Miyagi 989-6711, Japan
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School of Forestry and Bio-Technology, Zhejiang A & F University, No. 666 Wusu Str., Lin’an District, Hangzhou 311314, China
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Wuyanling National Nature Reserve of Zhejiang, Northwest of the County, Wenzhou 325500, China
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Division of Forest and Biomaterials Science, Faculty of Agriculture, Kyoto University, Kitashirakawa-oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
*
Author to whom correspondence should be addressed.
Plants 2020, 9(9), 1159; https://doi.org/10.3390/plants9091159
Received: 29 July 2020 / Revised: 3 September 2020 / Accepted: 4 September 2020 / Published: 8 September 2020
(This article belongs to the Special Issue Diversification of Angiosperms)
Meehania montis-koyae Ohwi (Lamiaceae), which has been considered a narrow endemic and endangered species in Japan, was found in eastern China in 2011. China and Japan belong to the same floristic region and share many plant species, but it is very rare that Japanese narrow endemic species are newly found outside of the country. We examined herbarium specimens of both countries, and conducted analyses of molecular phylogenetics, population genetics, and divergence time estimation using two nuclear (ITS and ETS) gene regions and MIG-seq data. Chinese plants tend to become larger than Japanese, and they are different in leaf shape and floral features. Molecular phylogenetic analysis shows Chinese and Japanese M. montis-koyae are the closest relatives to each other. Population genetic analysis indicates no current gene flow between the Chinese and Japanese populations, and divergence time analysis shows they were separated during the late Miocene. We reach the conclusion that Chinese and Japanese M. montis-koyae have already become distinct biological entities, and a new taxon name Meehania zheminensis A. Takano, Pan Li, G.-H.Xia is proposed for the Chinese plants. A key to Asian Meehania species is provided. View Full-Text
Keywords: Lamiaceae; Meehania montis-koyae; MIG-seq; population genetic analysis; Sino-Japanese disjunct distribution Lamiaceae; Meehania montis-koyae; MIG-seq; population genetic analysis; Sino-Japanese disjunct distribution
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MDPI and ACS Style

Takano, A.; Sakaguchi, S.; Li, P.; Matsuo, A.; Suyama, Y.; Xia, G.-H.; Liu, X.; Isagi, Y. A Narrow Endemic or a Species Showing Disjunct Distribution? Studies on Meehania montis-koyae Ohwi (Lamiaceae). Plants 2020, 9, 1159.

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