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

doi:10.1111/jse.12448

J Syst Evol ›› 2018, Vol. 56 ›› Issue (4): 374-393.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 Wen^1*, Limin Lu^2*, Tsai-Wen Hsu³, Viet Cuong Dang^2,4, Sadaf Habib^2,4, John K. Boggan¹, Hiroshi Okada⁵, Iju Chen⁶, Zhi-Duan 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

Received:2018-04-04 Accepted:2018-06-25 Published:2018-07-10

Abstract

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.

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

Jun Wen, Limin Lu, Tsai-Wen Hsu, Viet Cuong Dang, Sadaf Habib, John K. Boggan, Hiroshi Okada, Iju Chen, Zhi-Duan Chen. Pseudocayratia, a new genus of Vitaceae from China and Japan with two new species and three new combinations[J]. J Syst Evol, 2018, 56(4): 374-393.

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

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