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      A threatened new species of Ipomoea (Convolvulaceae) from the Brazilian Cerrado revealed by morpho-anatomical analysis

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          Abstract

          A new species of Ipomoea , endemic to the Cerrado domain in Maranhão, Brazil, is described. Ipomoea maranhensis D.Santos & Buril, sp. nov. has been misidentified as I. burchellii Meisn. in several herbaria. Even though both species have oblong, pubescent leaves, they can be distinguished by morpho-anatomical characters. We present a diagnosis, complete description, illustration, taxonomic comments, conservation status and distribution map.

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          Most cited references 27

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          Recent assembly of the Cerrado, a neotropical plant diversity hotspot, by in situ evolution of adaptations to fire.

          The relative importance of local ecological and larger-scale historical processes in causing differences in species richness across the globe remains keenly debated. To gain insight into these questions, we investigated the assembly of plant diversity in the Cerrado in South America, the world's most species-rich tropical savanna. Time-calibrated phylogenies suggest that Cerrado lineages started to diversify less than 10 Mya, with most lineages diversifying at 4 Mya or less, coinciding with the rise to dominance of flammable C4 grasses and expansion of the savanna biome worldwide. These plant phylogenies show that Cerrado lineages are strongly associated with adaptations to fire and have sister groups in largely fire-free nearby wet forest, seasonally dry forest, subtropical grassland, or wetland vegetation. These findings imply that the Cerrado formed in situ via recent and frequent adaptive shifts to resist fire, rather than via dispersal of lineages already adapted to fire. The location of the Cerrado surrounded by a diverse array of species-rich biomes, and the apparently modest adaptive barrier posed by fire, are likely to have contributed to its striking species richness. These findings add to growing evidence that the origins and historical assembly of species-rich biomes have been idiosyncratic, driven in large part by unique features of regional- and continental-scale geohistory and that different historical processes can lead to similar levels of modern species richness.
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            Ipomoea (Convolvulaceae) in Bolivia

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              ANATOMY OF THE INFERIOR OVARY OF DARBYA

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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
                17 June 2020
                : 151
                : 93-106
                Affiliations
                [1 ] Programa de Pós-Graduação em Botânica, Laboratório de Sistemática Integrativa, Universidade Federal Rural de Pernambuco, Av. Manoel de Medeiros, s/n, Dois Irmãos, 50670-901, Recife, Pernambuco, Brazil Universidade Federal Rural de Pernambuco Recife Brazil
                [2 ] Programa de Pós-Graduação em Agroecologia, Universidade Estadual do Maranhão, Av. Lourenço Vieira da Silva, s/n, Jardim São Cristóvão, 65055-970, São Luís, Maranhão, Brazil Universidade Estadual do Maranhão São Luís Brazil
                [3 ] Departamento de Botânica, Laboratório de Anatomia Vegetal, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, Cidade Universitária, 50670-901, Recife, Pernambuco, Brazil Universidade Federal de Pernambuco Recife Brazil
                Author notes
                Corresponding author: Diego Santos ( fdsantosbot@ 123456gmail.com )

                Academic editor: L. Giacomin

                Article
                49833
                10.3897/phytokeys.151.49833
                7314863
                Diego Santos, Raysa Valéria Carvalho Saraiva, Tiago Massi Ferraz, Emília Cristina Pereira Arruda, Maria Teresa Buril

                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.

                Funding
                Funded by: Conselho Nacional de Desenvolvimento Científico e Tecnológico 501100003593 http://doi.org/10.13039/501100003593
                Categories
                Research Article
                Convolvulaceae
                Identification Key
                Taxonomy
                South America

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