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Ya-Fang Yin, Xiao-Li Liu and Ye-Ming Cheng

A new species of Moroxylon, M. xinhuaensis Yin, Liu & Cheng, with wood anatomical features found in modern Morus (Moraceae), is described from the Neogene of Xinhua, Yuanmou Basin, Yunnan Province, southwest China. This wood represents the first fossil wood of Morus reported from Asia. It provides additional data for evaluating relationships between the Neogene floras of Europe and eastern Asia.

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Ye-Ming Cheng, David K. Ferguson, Cheng-Sen Li, Xiao-Mei Jiang and Yu-Fei Wang

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Ye-Ming Cheng, R.C. Mehrotra, Yue-Gao Jin, Wei Yang and Cheng-Sen Li

A new species of Pistacioxylon, Pistacioxylon leilaoensis Cheng et al., showing affinities with Pistacia of the Anacardiaceae is described from the Miocene of Leilao, Yuanmou Basin, Yunnan Province, southwest China. It provides data for reconstructing the phytogeographic history of Pistacia and the paleoenvironment of the Yuanmou Basin. This fossil suggests a long history of exchange of various taxa including Pistacia between Europe and East Asia during the Tertiary.

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Ye-Ming Cheng, Ya-Fang Yin, R.C. Mehrotra and Cheng-Sen Li

Koelreuteria yuanmouensis sp. nov. (Sapindaceae) is described from the Pliocene fluvio-lacustrine rocks of Hutiaotan Earth Forest, Yuanmou Basin, Yunnan, China. This is the first report of fossil Koelreuteria wood from Asia. The history of the genus is reviewed. Fruits and leaves of the genus have been reported from the Paleocene onwards in Asia, North America, and Europe, with the genus becoming restricted to East Asia during the Neogene.

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Ye-Ming Cheng, Xiao-Nan Yang, Zhe-Feng He, Bing Mao and Ya-Fang Yin

We describe a new species, Gleditsioxylon jiangsuensis (Leguminosae), a new record of Robinia zirkelii (Platen) Matten, Gastaldo & Lee (Leguminosae), and a new record of Moroxylon xinhuaensis Yin, Liu & Cheng (Moraceae) from the early Miocene strata of Sihong County in Jiangsu Province, eastern China. Gleditsioxylon jiangsuensis sp. nov. is the first report of Gleditsioxylon fossil wood from China. These fossil woods, combined with paleontological records, may indicate that the boundary between the subtropical and the temperate zones in eastern China during the early Miocene was located north of its modern location.

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Ye-Ming Cheng, Yu-Fei Wang, Feng-Xiang Liu, Yue-Gao Jin, R. C. Mehrotra, Xiao-Mei Jiang and Cheng-Sen Li

Edited by E.A. Wheeler

ABSTRACT

The Pliocene fluvio-lacustrine sediments of the Yuanmou Basin, Yunnan, near the southeastern part of Qinghai-Tibet Plateau, China, have yielded diverse and abundant assemblages of fossilized mammals and woods. The Yuanmou fossil woods reveal a wood flora with the highest diversity in the Cenozoic wood in China. The woods can play an important role in understanding palaeofloristics and in reconstructing palaeoclimate of southeastern China. In this study, we describe ten angiosperm taxa and three gymnosperm taxa namely: Castanopsis makinoi (Ogura) Suzuki & Terada (Fagaceae), Cedreloxylon cristalliferum Selmeier (Meliaceae), Dalbergioxylon biseriatensis sp. nov. (Fabaceae), Lagerstroemioxylon yuanmouensis Cheng, Li, Jiang & Wang (Lythraceae), Lithocarpoxylon microporosum sp. nov., Lithocarpoxylon sp. (Fagaceae), Paraalbizioxylon sinica sp. nov., P. yunnanensis sp. nov. (Fabaceae), Pterocaryoxylon huxii sp. nov. (Juglandaceae), Zelkova wakimizui (Watari) Watari (Ulmaceae), Abies sp. (Pinaceae), Cephalotaxus sp. (Cephalotaxaceae), and Picea sp. (Pinaceae). Nearest living relative (NLR) comparisons of these taxa, coupled with previously identified taxa, suggest that altitudinal vegetation zones were present in the Yuanmou region during the Pliocene: (i) subtropical evergreen and deciduous mixed broad-leaved forest dominated by Pterocarya/Juglans, Albizia/Acacia, Bischofia and allied taxa at lower elevations, (ii) subtropical evergreen broad-leaved forest dominated by Quercus/Lithocarpus and Castanopsis at middle altitudes of mountains around the basin, and (iii) evergreen coniferous forest of Abies, Picea and other genera at the higher elevations of the mountains. Based on the habits of the NLRs, the prevailing climate was probably humid subtropical and thus differed from the present-day hot and dry climate supporting savanna. It is suggested that subtropical forest was predominant in Yunnan, while tropical rainforest occurred in southwest Asia and India during the same period. The uplift of the mountains near the Qinghai-Tibet plateau in western Yunnan presumably acted as a barrier to block warm and humid air from the Indian Ocean, which influenced the dispersal and distribution of plants.