Jabaily, Rachel , Shepherd, Kelly , Motley, Timothy .
Molecular and morphological evidence towards a taxonomic revision of paraphyletic Goodenia (Goodeniaceae).
Goodenia, the largest genus (190+species) in the primarily Australian family Goodeniaceae, is highly paraphyletic and in great need of taxonomic revision. Previous and ongoing molecular systematic studies of the family using loci trnL-F, matK, psbA-trnH, and nrITS by our research group have determined that the genera Velleia, Verreauxia, Coopernookia, Selliera, Pentaptilon, as well as Scaevola collaris, are embedded within the broader Goodenia s.l. clade. Currently there appears to be no morphological features that unite all members of Goodenia s.l., and most of the included smaller genera are well-defined morphologically, and monophyletic. Species sampled from Goodenia s.str. form three monophyletic clades with varying levels of support. Several subclades correspond to current and previous subgeneric taxonomic delineations defined principally by aspects of fruit and floral morphology. Revision of Goodenia in to several new genera is deemed to be the better course of action than subsuming all included taxa into an expanded Goodenia. Inclusion of broader taxon sampling and greater molecular sequence data is necessary before a formal revision can take place. Monophyletic Goodenia s.l. differs from sister clade Scaevola s.l. by encompassing a greater diversity in floral and fruit morphology, as well as a higher average rate of molecular evolution. A taxonomic scheme that reflects evolutionary relationships will be an important framework for further studies of many aspects of evolution in this charismatic group.
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1 - Rhodes College, Biological Sciences, Memphis, TN, USA
2 - Western Australian Herbarium, Department Of Environment And Conservation, Locked Bag 104, Bentley Delivery Centre, Bentley, N/A, 6983, Australia
3 - Old Dominion University, Biological Sciences, 110 Mills Godwin/ W 45th St., Norfolk, VA, 23529, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Franklin A/Hyatt
Date: Monday, July 9th, 2012
Time: 10:00 AM