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Abstract Detail



Systematics Section/ASPT

Eserman, Lauren [1], Miller, Richard [2].

Taxonomy and phylogenetics of a small group of morning glories.

Ipomoea section Pharbitis is a highly diverse group of species, consisting of both widely distributed agricultural weeds (e.g. I. indica, I. purpurea) and many rare endemics (e.g. I. villifera, I. temascaltepecensis). Species in this group are recognizable by a three-locular capsule and herbaceous sepals. A comprehensive taxonomic revision was undertaken to improve the understanding of the systematics of these species. Phylogenetic data from two nuclear loci (ITS, ANS) and three chloroplast intergenic spacers (rpL32-trnL, trnD-trnT, and trnS-trnG) as well as morphological characters supported the monophyly of sect. Pharbitis. Previous work suggested there were as many as fifteen species within sect. Pharbitis. However, this study identified seven monophyletic species and two species complexes, the focus of the revision. Relationships were unresolved for three named species. In contrast to expectations, results of this study did not support the reciprocal monophyly of I. hederacea and I. nil; rather, these two named species formed a well-supported species complex. It is clear that lineages within sect. Pharbitis, such as these species complexes, deserve further investigation. This research has provided both a systematic context for future morning glory research and synthetic descriptions of understudied wild relatives of many widely studied species. 


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1 - University of Georgia, Plant Biology, 2502 Miller Plant Sciences, Athens, GA, 30602, United States
2 - SOUTHEASTERN LOUISIANA UNIVERSITY, Department Of Biological Sciences, Hammond, LA, 70402, USA

Keywords:
morning glories
Ipomoea
taxonomy
phylogenetics
taxonomic revision.

Presentation Type: Oral Paper:Papers for Sections
Session: 33
Location: River Fork/Grove
Date: Wednesday, July 30th, 2014
Time: 9:15 AM
Number: 33006
Abstract ID:716
Candidate for Awards:None


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