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Abstract Detail


Schilling, Edward [1], Panero, Jose [2].

A changed circumscription of Eupatorium (Asteraceae) alters its biogeographic story.

A prerequisite for biogeographic analysis is to have a complete understanding of the basic classification of the group being studied. Here we provide an example that shows how increasing the accuracy of a classification of a group can fundamentally change the understanding of its past biogeographic history. The late 20th century reduction of the former mega-genus Eupatorium left a modest (30-40 species) core with an apparent Arcto-Tertiary distribution: multiple species in eastern North America and eastern Asia with a single one in Europe. Molecular based studies have since upheld all of the segregates that have been examined, but somewhat surprisingly, the case of Stomatanthes, which involves one of the most unusual geographic distributions for the tribe, has not received close scrutiny. We present data that show that Stomatanthes, the core group of which is African, is a phylogenetic ingroup that should be submerged in Eupatorium. The phylogenetic position of the African clade places it between the North American and the European and Asian clades, making it the highest probability that dispersal of Eupatorium from New World to Old World went first to Africa. This renders moot the earlier question of whether dispersal occurred across the North Atlantic Land Bridge or the Bering Land Bridge, and removes Eupatorium from the list of genera with a classical Arcto-Tertiary distribution.

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1 - University Of Tennessee, Department Of Ecology & Evolutionary Biology, 569 Dabney Hall, KNOXVILLE, TN, 37996-1610, USA
2 - University of Texas, Section of Integrative Biology, 1 University Station C0930, Austin, TX, 78712, USA


Presentation Type: Oral Paper
Session: 46, Asterids I part C & Asterids II
Location: 103/Savannah International Trade and Convention Center
Date: Wednesday, August 3rd, 2016
Time: 3:45 PM
Number: 46008
Abstract ID:184
Candidate for Awards:None

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