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2 Florida Museum of Natural History, University of Florida, Gainesville, Florida 32611-7800 USA; and 3 Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3DS, UK
The monophyly of and phylogenetic relationships within the orchid tribe Maxillarieae Pfitzer were evaluated using parsimony analyses of combined nuclear ribosomal and plastid DNA sequence data of ITS 1 and 2, matK, and the trnL intron and the trnL-F intergene spacer. Each of the separate analyses produced highly congruent but weakly supported patterns (by the bootstrap), so these were combined in a single analysis. Analysis of 90 ingroup taxa (representing
35% of currently recognized genera) and four outgroup taxa produced resolved and highly supported cladograms. Based on the cladograms, we recognize six subtribes: Eriopsidinae, Oncidiinae (including Pachyphyllinae, Ornithocephalinae, and Telipogoninae), Stanhopeinae, Coeliopsidinae, Maxillariinae (including Lycastinae and Bifrenariinae), and Zygopetalinae (including Cryptarrheninae, Dichaeinae, Huntleyinae, and Warreinae). Stanhopeinae were sampled most intensively; their generic relationships were highly resolved in the analysis and largely agree with currently accepted generic concepts based on morphology. Coeliopsidinae (Coeliopsis, Lycomormium, Peristeria) are sister to Stanhopeinae. Correlations are drawn among phylogeny, pollination mechanisms, and life history traits.
Key Words: Coeliopsidinae ITS matK Maxillarieae Maxillariinae Orchidaceae Stanhopeinae trnL-F
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