Systematics/Phytogeography / Taxonomie/ Section
Flicker, Benjamin , Ballard, H. E. .
Systematic revision of the Hybanthus enneaspermus complex (Violaceae) in tropical Southeast Asia and northern Australia.
The Hybanthus enneaspermus complex in tropical Southeast Asia and northern Australia is reexamined using traditional methods. Considering details of vegetative and reproductive morphology, three species are retained: H. enneaspermus (L.) F. Muell., H. aurantiacus (F. Muell. ex Benth.) F. Muell., and H. stellarioides (Domin.) P. Forster. H. enneaspermus is temporarily split as two varieties: var. enneaspermus and var. verbi-divini Everaarts. Hybanthus enneaspermus var. enneaspermus is the most common and wide-ranging taxon, with variable habit and purple flowers, being somewhat weedy throughout the Old World tropics from Africa to the South Pacific. The species' var. verbi-divini is a large subshrub with large brick-red flowers of this group limited to few localities in the Lesser Sunda Islands of Indonesia. Hybanthus aurantiacus is a woody subshrub with orange flowers found in dry regions of northern Australia, while H. stellarioides is a small herb similar in habit to enneaspermus var. enneaspermus, but with orange flowers, limited to northern Australia and Papua New Guinea. Diagnostic features and geographic ranges of all recognized taxa will be presented. Recent molecular evidence for the Violaceae suggests that Hybanthus is polyphyletic and needs to be recircumscribed into several distinct genera, with the H. enneaspermus complex and close relatives in the Old World segregated to a distinct genus. Circumscription of this new genus and future transfer of the taxa evaluated here, as well as raising of var. verbi-divini to species status, will be discussed.
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1 - Ohio University, Environmental and Plant Biology, Porter Hall, Athens, Ohio, 45701, U.S.A.
2 - Ohio University, Department of Environmental & Plant Biology, Porter Hall, Richland Avenue, Athens, Ohio, 45701-2979, USA
Presentation Type: Oral Paper:Papers for Sections
Date: Wednesday, July 30th, 2008
Time: 2:30 PM