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Chengia laxispicata gen. et sp. nov., a new ephedroid plant from the Early Cretaceous Yixian Formation of western Liaoning, Northeast China: evolutionary, taxonomic, and biogeographic implications

Yong Yang, Longbiao Lin and Qi Wang*

BMC Evolutionary Biology 2013, 13:72  doi:10.1186/1471-2148-13-72

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