Combined phylogenetic analysis in the Rubiaceae‐Ixoroideae: morphology, nuclear and chloroplast DNA data

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Abstract
Parsimony analyses of morphology, restriction sites of the cpDNA, sequences from the nuclear, ribosomal internal transcribed spacer (ITS), and the chloroplast generbcLwere performed to asses tribal and generic relationships in the subfamily Ixoroideae (Rubiaceae). The tribes Vanguerieae and Alberteae (Antirheoideae) are clearly part of Ixoroideae, as are some Cinchonoideae taxa. Pavetteae should excludeIxoraand allies, which should be recognized as the tribe Ixoreae.Heinsenia, representing Aulacocalyceae, is part of Gardenieae, as isDuperrea, a genus earlier placed in Pavetteae.PosoqueriaandBertieraand the taxa in the subtribe Diplosporinae should be excluded from Gardenieae.Bertieraand three Diplosporinae taxa are part of Coffeeae, whileCremaspora(Diplosporinae) is best housed in a tribe of its own, Cremasporeae. The mangrove genusScyphiphora, recently placed in Diplosporinae, is closer to Ixoreae and tentatively included there. The combined analysis resulted in higher resolution compared to the separate analyses, exemplifying that combined analyses can remedy the incapability of one data set to resolve portions of a phylogeny. Twenty‐four newrbcLsequences representing all five Ixoroideae tribes (sensu Robbrecht) are presented.
Funding Information
  • Royal Swedish Academy of Sciences

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