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Article
Published: 2021-07-27

Nuclear ITS/ETS sequence data indicate the membership of Senecio racemulifer, but not S. acutipinnus and S. graciliflorus, within the genus Jacobaea (Asteraceae, Senecioneae)

Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China, Center of Conservation Biology, Core Botanical Gardens, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China, University of Chinese Academy of Sciences, Beijing 100049, China
Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing 210014, China
Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China, Center of Conservation Biology, Core Botanical Gardens, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China, Key Laboratory of Digital Botanical Garden of Guangdong Province, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, Guangdong 510650, China
Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China, Center of Conservation Biology, Core Botanical Gardens, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China
Eudicots karyology molecular systematics new record new synonymy taxonomy

Abstract

The sectional placement of Senecio racemulifer (Asteraceae, Senecioneae) and the generic affiliation of S. acutipinnus and S. graciliflorus have been in dispute. Senecio racemulifer was tentatively considered a member of S. sect. Doria, and S. acutipinnus and S. graciliflorus were transferred to the genus Jacobaea as J. acutipinna and J. graciliflora, respectively. Our phylogenetic analyses based on nuclear ITS/ETS sequences indicate that S. racemulifer is deeply nested with Jacobaea species in a well-supported clade while S. acutipinnus and S. graciliflorus are nested with other Senecio species in a well-supported clade. We therefore transfer S. racemulifer to Jacobaea as J. racemulifera but retain S. acutipinnus and S. graciliflorus within Senecio. The names Jacobaea acutipinna, J. graciliflora, J. sect. Graciliflorae and S. ser. Racemuliferae are all synonymized. Karyological characters are reported for the three species. Jacobaea racemulifera, earlier known from the Western Tian-Shan (Kazakhstan, Kyrgyzstan, Uzbekistan), is reported here as new to China.

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