Systematics Section / ASPT
Krosnick, Shawn E. , Freudenstein, John .
Resolving the phylogenetic position of Hollrungia and Tetrapathaea: the end of two monotypic genera in Passifloraceae.
THE Passifloraceae consists of approximately 17 genera and more than 670 species distributed throughout tropical and subtropical regions in both the New and Old World. Two monotypic and dioecious genera, Tetrapathaea tetrandra and Hollrungia aurantioides, exhibit several morphological similarities to Passiflora. Recent analyses have suggested that these species actually belong to Passiflora, but these results required further examination. Further, a new species that is closely related to Hollrungia aurantioides was recently identified. Three gene regions, ITS, trnL-F and ncpGS, and morphological characters were used to examine the relationships of these species to one another and to the rest of the genus Passiflora. The results confirmed the placement of T. tetrandra, H. aurantioides and P. sp. nov. as part of Passiflora. These species formed a monophyletic lineage closely associated with the subgenera Astrophea, Deidamioides, and Decaloba. The resulted identified several morphological synapomorphies including inflorescence structure, operculum condition, and growth form. The recognition of these species as part of Passiflora subgenus Tetrapathaea was part of a taxonomic treatment of the group, thus raising the number of subgenera in Passiflora from four (sensu Feuillet & MacDougal 2003) to five.
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1 - Ohio State University, Department of Evolution, Ecology and Organismal Biology, Museum of Biological Diversity, 1315 Kinnear Rd., Columbus, Ohio, 43212, USA
Comparitive floral morphology
Presentation Type: Oral Paper:Papers for Sections
Date: Monday, July 31st, 2006
Time: 2:30 PM