Franck, Alan .
Phylogeny, biogeography, & subgeneric classification of Harrisia.
Based on sequences of taxa within Cereeae sensu Nyffeler & Eggli from two nuclear and two plastid loci, Harrisia is a well supported monophyletic genus. The molecular analyses also found high support for four groups within Harrisia, which are treated as subgenera and morphologically interpreted. A dated phylogeny was produced, calibrated on the possible origin of a Plio-Pleistocene caatinga (H. adscendens) and a Pliocene subandean Chaco (H. tetracantha). Caribbean (subg. Harrisia) and chaco species (subg. Eriocereus) of Harrisia were nearly identical for the four loci and are subtly separable morphologically. Harrisia is biogeographically interpreted as originating near the Bolivian Andes, spreading into the chaco and caatinga, and from the caatinga dispersing into the Caribbean.
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1 - University of South Florida, cmmb, bsf 218, 4202 E. Fowler Ave., Tampa, Fl, 34241, usa
Presentation Type: Oral Paper:Papers for Sections
Location: Lindell B/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 2:45 PM