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Phylogenetic Relationships and Evolution in the Strelitziaceae (Zingiberales)

2012; American Society of Plant Taxonomists; Volume: 37; Issue: 3 Linguagem: Inglês

10.1600/036364412x648562

1548-2324

G.V. Cron, Cary Pirone, Madelaine Bartlett, W. John Kress, Chelsea D. Specht,

Plant and Fungal Species Descriptions

Abstract Evolutionary trends and phylogenetic relationships in the Strelitziaceae (Zingiberales) were investigated using sequence data from ten plastid and two nuclear regions and a morphological dataset. The status of species of Strelitzia were evaluated in terms of the phylogenetic species concept. Relationships among the genera remain equivocal with two hypotheses emerging: (i) Strelitzia sister to a clade comprising Ravenala and Phenakospermum when indels are included, or (ii) Ravenala sister to the remainder of the Strelitziaceae when indels are excluded in/from the combined molecular and ‘total evidence’ analyses. Within Strelitzia, S. nicolai is sister to the rest of the genus, with S. alba sister to S. caudata. Strelitzia reginae is shown to be paraphyletic as S. juncea is nested within it, but more sampling at the population level is needed to confirm the taxonomic status of S. juncea. The highly localized and endangered Strelitzia alba is confirmed as a distinct species, as are S. caudata and S....