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Abstract Detail



Systematics Section/ASPT

Porter-Utley, Kristen [1], Krosnick, Shawn [2], McDade, Lucinda [3], MacDougal, John [4], Jorgensen, Peter [5].

Untangling the passionflower vines: more insights on the phylogeny of Passiflora subg. Decaloba.

Passiflora is a large genus of more than 560 species of vines, lianas, trees, and shrubs known for its morphological diversity. The genus is currently recognized with five subgenera: Astrophea (ca. 60 spp.), Decaloba (ca. 230 spp.), Deidamioides (14 spp.), Passiflora (ca. 250 spp.), and Tetrapathea (3 spp.). Subgenus Passiflora has been the focus of most recent scientific study, in part due to the economic importance of some species. Comparatively little is known about subg. Decaloba, even though it is the second largest subgenus in Passiflora and displays incredible morphological and ecological variation. It also has the broadest geographical range of any of the subgenera, with species naturally present in both the New and Old World. Subgenus Decaloba contains eight supersections, and we present here a phylogenetic analysis of the subgenus based on a multi-gene data set and including taxa that represent all supersections and all four subgenera in Passiflora. These data support the monophyly of subgenus Decaloba and the supersections Auriculata, Bryonioides, Cieca, Decaloba, Disemma, Hahniopathanthus, and Pterosperma, but suggest that Multiflora is polyphyletic as currently defined. We will examine morphological synapomorphies for each major clade in our phylogeny and examine the evolutionary lability in several notable characters associated with plant- pollinator and plant-herbivore relationships (e.g., floral bract morphology, shoot tip orientation, structure of the floral nectary, the presence or absence and structure of extrafloral nectaries). We also use the phylogenetic framework to explore rates of diversification across the subgenus. The molecular phylogeny supports a New World origin for Passiflora, with two independent radiations to the Old World. Finally, we will examine the complex biogeographical history of the two Old World clades (Tetrapathea and Disemma). This is the third presentation stemming from NSF 0717084 to PIs P.M. Jørgensen, S. Krosnick, J.M. MacDougal, L. McDade, and K. Porter-Utley.

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1 - Keene State College, Biology, 229 Main St., Keene, NH, 034335, USA
2 - Southern Arkansas University, Department of Biology, 100 East University Street, Magnolia, AR, 71753, USA
3 - Rancho Santa Ana Botanic Garden and Claremont Graduate University, Botany, 1500 N. College Ave., Claremont, CA, 91711, USA
4 - Harris-Stowe State University, Mathematics and Natural Sciences, 3026 Laclede Ave., St. Louis, MO, 63103, USA
5 - Missouri Botanical Garden, P.O. Box 299, St. Louis, MO, 63166, USA

Keywords:
Passiflora
Subgenus Decaloba
morphology
molecular
Systematics
Passifloraceae.

Presentation Type: Oral Paper:Papers for Sections
Session: 5
Location: Rosedown/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 8:30 AM
Number: 5001
Abstract ID:588
Candidate for Awards:None


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