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      Lectotypification of the name Melastoma candidum f. albiflorum and its taxonomic status

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          Abstract

          A nomenclatural and taxonomic treatment of the name Melastoma candidum f. albiflorum ( Melastomataceae ) is presented. A lectotype is designated for this name, with an updated morphological description based on fresh material. The name Melastoma candidum f. albiflorum is proposed as a heterotypic synonym of Melastoma candidum .

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          Most cited references 11

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          International Code of Nomenclature for algae, fungi, and plants

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            Holotype specimens and type citations: General issues

             John McNeill (2014)
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              Melastomeae come full circle: biogeographic reconstruction and molecular clock dating.

               S S Renner,  K. Meyer (2001)
              Rhexia, with 11 species in the Coastal Plain province of North America, is the only temperate zone endemic of the tropical eudicot family Melastomataceae. It is a member of the only pantropical tribe of that family, Melastomeae. Based on the chloroplast gene ndhF, we use a fossil-calibrated molecular clock to address the question of the geographic origin and age of Rhexia. Sequences from 37 species in 21 genera representing the tribe's geographical range were analyzed together with five outgroups. To obtain better clade support, another chloroplast region, the rpl16 intron, was added for 24 of the species. Parsimony analysis of the combined data and maximum-likelihood analysis of ndhF alone indicate that the deepest split is between Rhexia plus its sister group, a small Central American genus, and all other Melastomeae. Old World Melastomeae are monophyletic and nested within New World Melastomeae. Although likelihood-ratio tests of clock and nonclock substitution models for the full or moderately pruned datasets rejected the clock, these models yielded identical topologies (for 30 taxa) with few significantly different branch lengths as assessed by a Student's t-test. Age estimates obtained were 22 million years ago (Mya) for the divergence of Rhexia from its sister group, 12 Mya for the dispersal of Melastomeae from the New World to West Africa, and 1 Mya for the diversification of Melastoma in Southeast Asia. The only other genus of Melastomeae to have reached Southeast Asia from Africa or Madagascar is Osbeckia. The age and geographic distribution of fossils, which come from Miocene sites throughout Eurasia, suggest that Melastomeae once ranged from Eurasia across Beringia to North America from whence they reached South America and subsequently Africa and Southeast Asia. Climate deterioration led to their extinction in the Northern Hemisphere, with Rhexia possibly surviving in Coastal Plain refugia.
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                Author and article information

                Contributors
                Journal
                PhytoKeys
                PhytoKeys
                3
                urn:lsid:arphahub.com:pub:F7FCE910-8E78-573F-9C77-7788555F8AAD
                PhytoKeys
                Pensoft Publishers
                1314-2011
                1314-2003
                2020
                08 May 2020
                : 146
                : 47-52
                Affiliations
                [1 ] Pubang Landscape Architecture Co., Ltd, Guangzhou 510600, China Pubang Landscape Architecture Co., Ltd Canton China
                [2 ] State Key Laboratory of Biocontrol and Guangdong Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China Sun Yat-sen University Guangzhou China
                Author notes
                Corresponding author: Xinjian Zhang ( zhangxj39@ 123456mail2.sysu.edu.cn ); Guangwen Tan (tanguangwen@pblandscape.com)

                Academic editor: R. Kriebel

                Article
                49929
                10.3897/phytokeys.146.49929
                7228939
                Xinjian Zhang, Jin-Hong Dai, Xiaozhou Liu, Zihua Li, Shiou Yih Lee, Renchao Zhou, Guangwen Tan

                This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                Categories
                Research Article
                Melastomataceae
                Biogeography
                Taxonomy
                Asia

                Plant science & Botany

                melastomataceae, flora of china, myrtales, plantae, taxonomy, synonym, melastoma

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