Franck, Alan .
Biogeography and systematics of Caribbean Harrisia (Cactaceae).
In the Caribbean occurs a group of closely related cacti in the genus Harrisia which has not been comparatively studied across different islands since the early 1900s. In order to clarify relationships, morphological and molecular comparisons were undertaken. Three plastid and four low-copy nuclear markers were sequenced for 21 samples from Caribbean Harrisia. An amplified fragment length polymorphisms (AFLP) analysis was also applied to the Caribbean Harrisia. Molecular relationships were visualized with bifurcating trees, neighbor-net networks, and haplotype networks. Morphology was examined from herbarium specimens, field studies, and cultivation of field-collected samples. Although many of the taxa recognized by Britton & Rose (1920) are maintained, their morphological distinction is based on entirely different characters. Results suggest one species to be basal to the rest and that initial colonization occurred in western Cuba with subsequent radiation northward into Florida and southeastward to reach Puerto Rico.
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1 - USF, CMMB, 4202 E Fowler Ave, Tampa, FL, 33620, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Franklin B/Hyatt
Date: Tuesday, July 10th, 2012
Time: 10:45 AM