Journal
PHYTOTAXA
Volume 543, Issue 1, Pages 51-63Publisher
MAGNOLIA PRESS
DOI: 10.11646/phytotaxa.543.1.5
Keywords
China; Japan; Compositae; Cirsium; taxonomy; expanded distribution area
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Funding
- National Natural Science Foundation of China [31970229, 32170211]
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Based on observations, we found that two recently described plant taxa from Zhejiang province in China are indistinguishable from two species from Japan. Therefore, we consider them as synonyms of the Japanese species, and their distribution area has expanded in China.
Based on observations on both herbarium specimens (including type materials) and living plants in their type localities, we demonstrate that Cirsium paludigenum and C. zhejiangense, two taxa recently described both from Zhejiang province of China, are indistinguishable from C. sieboldii and C. yezoense, two species with their type localities from Japan. We therefore reduce C. paludigenum to the synonymy of C. sieboldii, and C. zhejiangense to the synonymy of C. yezoense. The distribution area of both C. sieboldii and C. yezoense are widely expanded in China.
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