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Phylogenetic structure and clade circumscriptions in the Gardenieae complex (Rubiaceae)
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Phylogenetic structure and clade circumscriptions in the Gardenieae complex (Rubiaceae)
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Phylogenetic structure and clade circumscriptions in the Gardenieae complex (Rubiaceae)
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Journal Article
Phylogenetic structure and clade circumscriptions in the Gardenieae complex (Rubiaceae)
2014
Overview
In this study we investigate the large and diverse Rubiaceae-Gardenieae and closely related tribes Bertiereae, Coffeeae, Cremasporeae, Octotropideae, and Pavetteae. Some of the tribes or groups have been shown to be monophyletic and strongly supported, but the phylogeny of this large complex is still far from being satisfactorily elucidated particularly for Gardenieae, both in terms of intertribal relationships as well as tribal delimitations. We reconstruct the phylogeny of the complex using an extensive sampling of 108 genera and five plastid DNA regions. Phylogenetic relationships demonstrate that Gardenieae sensu Andreasen & Bremer is polyphyletic, asBurchellia, Didymosalpinx, Monosalpinx, andMantalaniaa re closer to Octot ropideae -Cremasporeae. In addition, Pavetteae and the investigated members of Aulacocalyceae are nested in a supported but partially unresolved Gardenieae-Pavetteae clade. Within this clade, several strongly supported groups are resolved: anAidiagroup, anAlibertiagroup, aGardeniagroup, Pavetteae includingPelagodendron, aPorterandiagroup, aRandiagroup, aRothmanniagroup (includingAulacocalyxandHeinsenia), aSherbourniagroup, and the two isolated generaMassulariaandSchumanniophyton. The latter genus presented a high rate of genetic substitutions, which resulted in perturbations of the phylogenetic reconstruction. A revised tribal circumscription is given for Gardenieae, theAlibertiagroup is recognized at tribal level as an emended Cordiereae, and a new tribe, Sherbournieae, is described to accommodate the members of theSherbourniagroup.
