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title: Fossil leaves of Buxus (Buxaceae) from the Upper Pliocene of Yunnan, SW China
author: Huang, Hua-Sheng;  Su, Tao;  Zhou, Zhe-Kun
Issued Date: 2018
Abstract: A new species, Buxus pliosinica H.S. Huang, T. Su et Z.K. Zhou n. sp. (Buxaceae) is designated based on leaf architecture and cuticular features of five compressed fossil leaves from the Upper Pliocene Sanying Formation of Yunnan, SW China. Leaves of B. pliosinica are elliptic and small, with entire margin, retuse tip, intramarginal vein, and exmedially ramified tertiary veins. The leaves are hypostomatic with anomocytic stomatal apparatuses and giant stomata. Based on comparisons of leaf morphological and cuticular features, B. sempervirens Linnaeus is considered as the nearest living relative of B. pliosinica. Morphologically, these species share similar elliptic shape and size, cuneate base, retuse tip, similar ranges of petiole length, angles of 2 degrees vein to midvein, and distance from the intramarginal vein to the margin. In terms of cuticular features, they are similar in type of stomatal apparatus, maximum length of giant stomata and range of stomatal length, but differ in the presence of indumentum. This discovery represents the first fossil record of Buxus from the SE margin of the Tibetan Plateau, and confirms the existence of Buxus in this region by the late Pliocene. Meanwhile, the newly described fossil species contributes to our understanding of the evolution of extant Buxus. (C) 2018 Elsevier Ireland Ltd Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. Published by Elsevier B.V. All rights reserved.
Related URLs: 10.1016/j.palwor.2017.12.003
Appears in Collections:其他_期刊论文

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Recommended Citation:
Huang, Hua-Sheng,Su, Tao,Zhou, Zhe-Kun. Fossil Leaves Of Buxus (buxaceae) From The Upper Pliocene Of Yunnan, Sw China[J]. Palaeoworld,2018,27(2):271-281.

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