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title: Carpinus tibetana (Betulaceae), a new species from southeast Tibet, China
author: Lu, Zhiqiang;  Li, Ying;  Yang, Xiaoyue;  Liu, Jianquan
Issued Date: 2018
Abstract: A new species Carpinus tibetana Z. Qiang Lu & J. Quan Liu from southeast Tibet is described and illustrated. The specimens of this new species were previously identified and placed under C. monbeigiana Hand.-Mazz. or C. mollicoma Hu. However, the specimens from southeast Tibet differ from those of C. monbeigiana from other regions with more lateral veins (19-24 vs 14-18) on each side of the midvein and dense pubescence on the abaxial leaf surface, while from those of C. mollicoma from other regions differ by nutlet with dense resinous glands and glabrous or sparsely villous at apex. Principal Component Analyses based on morphometric characters recognise the Tibetan populations as a separate group. Nuclear ribosomal ITS sequence variations show stable and distinct genetic divergences between the Tibetan populations and C. monbeigiana or C. mollicoma by two or three fixed nucleotide mutations. Phylogenetic analysis also identified three respective genetic clusters and the C. mollicoma cluster diverged early. In addition, the Tibetan populations show a disjunct geographic isolation from the other two species. Therefore, C. tibetana, based on the Tibetan populations, is here erected as a new species, distinctly different from C. monbeigiana and C. mollicoma.
Source: PHYTOKEYS
Related URLs: 10.3897/phytokeys.98.23639
Appears in Collections:其他_期刊论文

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Recommended Citation:
Lu, Zhiqiang,Li, Ying,Yang, Xiaoyue,et al. Carpinus Tibetana (betulaceae), A New Species From Southeast Tibet, China[J]. Phytokeys,2018(98):1-13.

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