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Three new fossil records of Equisetum (Equisetaceae) from the Neogene of south-western China and northern Vietnam.


ABSTRACT: Three fossil species of Equisetum (Equisetaceae) were reported from the Neogene of south-western China and northern Vietnam, based on well-preserved rhizomes with tubers. Equisetum cf. pratense Ehrhart from the middle Miocene of Zhenyuan County, Yunnan Province, China is characterised by a bunch of three ovate tubers with longitudinal ridges on the surface. Equisetum yenbaiense A.T. Aung, T. Su, T.V. Do & Z.K. Zhou, sp. nov. from the late Miocene of Yenbai Province, Vietnam is characterised by four bunches of elongate tubers arranged in a whorl on a node. Equisetum yongpingense A.T. Aung, T. Su & Z.K. Zhou, sp. nov. from the late Pliocene of Yunnan is characterised by fibrous roots on most nodes and two to four bunches of large cylindrical tubers arranged in a whorl on a node. Floristic assemblages suggest that these species might have grown near a riverside or lakeshore. These new fossil records improve our understanding of species richness of Equisetum and their distribution range during the Neogene in Asia.

SUBMITTER: Aung AT 

PROVIDER: S-EPMC6969027 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Three new fossil records of <i>Equisetum</i> (Equisetaceae) from the Neogene of south-western China and northern Vietnam.

Aung Aye Thida AT   Huang Jian J   Do Truong Van TV   Song Ai A   Liu Jia J   Zhou Zhe-Kun ZK   Su Tao T  

PhytoKeys 20200110


Three fossil species of <i>Equisetum</i> (Equisetaceae) were reported from the Neogene of south-western China and northern Vietnam, based on well-preserved rhizomes with tubers. Equisetum cf. pratense Ehrhart from the middle Miocene of Zhenyuan County, Yunnan Province, China is characterised by a bunch of three ovate tubers with longitudinal ridges on the surface. <i>Equisetum yenbaiense</i> A.T. Aung, T. Su, T.V. Do & Z.K. Zhou, <b>sp. nov.</b> from the late Miocene of Yenbai Province, Vietnam  ...[more]

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