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TAXON

Plant Diversity and Resources

Journal of Systematics and Evolution

Volume 56 Issue 4, Pages 374393.

Published Online: 17 July 2018

DOI: 10.1111/jse.12448

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Pseudocayratia, a new genus of Vitaceae from China and Japan with two new species and three new combinations

Jun Wen1*, Limin Lu2*, Tsai-Wen Hsu3, Viet Cuong Dang2,4, Sadaf Habib2,4, John K. Boggan1, Hiroshi Okada5, Iju Chen6, Zhiduan Chen2

1Department of Botany, National Museum of Natural History, Smithsonian Institution, PO Box 37012, Washington, DC 20013-7012

2State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093

3Endemic Species Research Institute, Nantou County, Nantou

4University of Chinese Academy of Sciences, Beijing 100049

5Osaka City University, Sumiyoshi-ku, Osaka, Osaka 558-8585

6Archaeology Department, Institute of History and Philology, Academia Sinica, Taipei

Keywords: Causonis, Cayratia, Pseudocayratia, Pseudocayratia dichromocarpa, Pseudocayratia oligocarpa, Pseudocayratia pengiana, Pseudocayratia speciosa, Pseudocayratia yoshimurae, Tetrastigma, Vitaceae

Abstract:

Recent integrative systematic studies of Vitaceae support the recognition of a new genus Pseudocayratia J.Wen, L.M.Lu & Z.D.Chen. The genus consists of five species from China and Japan. We herein describe the following two new species: Pseudocayratia speciosa J.Wen & L.M.Lu, and P. pengiana Hsu & J.Wen, and make three new combinations: Pseudocayratia dichromocarpa (H.Lév.) J.Wen & Z.D.Chen, P. oligocarpa (H.Lév. & Van.) J.Wen & L.M.Lu, and P. yoshimurae (Makino) J.Wen & V.C.Dang. Phylogenetic analyses based on five chloroplast loci strongly support Pseudocayratia as sister to Tetrastigma. Morphologically, species of the genus have stigmas enlarged (but not 4\lobed), pedicels at fruiting stage enlarged and fleshy, seeds with a crustaceous thin testa, circular cup\like ventral infolds, linear chalaza extending ca. 2/3 to 3/4 of the seed length (from apex to base), lateral margin with thin edges, and T\shaped endosperm in cross\section. The genus is distributed in eastern Asia (China and Japan). The taxonomic novelties we report in this study at both the generic and species levels highlight the importance of collections\based research in today's integrative systematics.

 

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