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dc.contributor.author
Salas, Roberto Manuel
dc.contributor.author
Viana, Pedro L.
dc.contributor.author
Cabral, Elsa Leonor
dc.contributor.author
Dessein, Steven
dc.contributor.author
Janssens, Steven
dc.date.available
2017-12-07T19:18:13Z
dc.date.issued
2015-05
dc.identifier.citation
Salas, Roberto Manuel; Viana, Pedro L.; Cabral, Elsa Leonor; Dessein, Steven; Janssens, Steven; Carajasia (Rubiaceae), a new and endangered genus from Carajás mountain range, Pará, Brazil; Magnolia Press; Phytotaxa; 206; 1; 5-2015; 14-29
dc.identifier.issn
1179-3155
dc.identifier.uri
http://hdl.handle.net/11336/30003
dc.description.abstract
Carajasia is described as a new genus of Rubiaceae. It is so far known only from the mountain summits of Serra dos Carajás (Pará, Brazil), where it is part of a shrubby vegetation surrounded by tropical rainforest. The new genus belongs to the tribe Spermacoceae and is positioned within it to the Spermacoce clade. Carajasia is unique within the clade in having a very particular combination of characters: flowering branches with two axillary flowers per node, homostylous flowers, corollas with a fringe of moniliform hairs, pubescent styles with distinct stigma lobes, bilobed nectariferous discs covered by triangular papillae, pollen with a double reticulum and fruits with a peculiar type of dehiscence. A detailed description of Carajasia is presented, including observations of the fruit and pollen, along with distribution maps and images of the plant in its habitat. A dichotomous key to distinguish Carajasia from other genera with deeply divided stigmas is provided. A molecular phylogenetic study was carried out using ITS and ETS sequences to determine the phylogenetic position of the new genus within the Spermacoce clade. The results of the combined analyses demonstrated that Carajasia is sister to Galianthe with moderate to high support. Both genera form a weakly supported clade with Schwendenera. This clade is sister to the other genera of the Spermacoce clade studied in this work. Galianthe and Schwendenera share with Carajasia pollen with a double reticulum, but they are clearly differentiated by suffruticose habit, heterostylous flowers and the pattern of fruit dehiscence. To clarify the phylogenetic position of Carajasia, some morphological characters are discussed based on the molecular results: division of the stigma,pollen types and floral syndrome.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Magnolia Press
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Galianthe
dc.subject
Spermacoce Clade
dc.subject
Filogenia
dc.subject
Taxonomia
dc.subject.classification
Otras Ciencias Biológicas
dc.subject.classification
Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Carajasia (Rubiaceae), a new and endangered genus from Carajás mountain range, Pará, Brazil
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-10-04T17:03:50Z
dc.identifier.eissn
1179-3163
dc.journal.volume
206
dc.journal.number
1
dc.journal.pagination
14-29
dc.journal.pais
Nueva Zelanda
dc.journal.ciudad
Auckland
dc.description.fil
Fil: Salas, Roberto Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; Argentina
dc.description.fil
Fil: Viana, Pedro L.. Museu Paraense Emílio Goeldi; Brasil
dc.description.fil
Fil: Cabral, Elsa Leonor. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; Argentina
dc.description.fil
Fil: Dessein, Steven. Botanic Garden Meise; Bélgica
dc.description.fil
Fil: Janssens, Steven. Botanic Garden Meise; Bélgica
dc.journal.title
Phytotaxa
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://biotaxa.org/Phytotaxa/article/view/phytotaxa.206.1.4
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.11646/phytotaxa.206.1.4
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