| Abstract Detail
Systematics Section / ASPT Lepis, Kate B. [1], Kulakowski, Dan [1], Struwe, Lena [2]. A new taxonomic classification for Chelonanthus (Gentianaceae) as supported by ribosomal nuclear, chloroplast and morphological data. CHELONANTHUS, a neotropical angiosperm genus in the tribe Helieae (Gentianaceae), has been plagued with conflict and taxonomic confusion for the last 100 years. A phylogeny based on molecular and morphological data supports a polyphyletic state with species positioned in two separate clades. The purple-flowered type species, Chelonanthus purpurascens, is positioned in a different clade than the green/white-corolla species. The latter group (green/white-colored Chelonanthus) is also paraphyletic unless the genera Rogersonanthus, Helia, and Adenolisianthus are included. This clade also contains the most common and widespread species of the genus, C. alatus, a polyphyletic species complex composed of six morphotypes. This is the first study to include all species of this clade along with the six morphotypes of C. alatus. A phylogeny based on ribosomal nuclear markers (5S-NTS & ITS), chloroplast markers (trnH-asbA & rps16), and morphology supports the reclassification of the green/white-flowered Chelonanthus, and the name with priority for this clade is Helia.
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Related Links:
Gentian Research Network
1 - Rutgers University, Department Plant Biology & Pathology, 237 Foran Hall, 59 Dudley Road, New Brunswick, New Jersey, 08901, USA
2 - Rutgers University, Ecology, Evolution, & Natural Resources, 14 College Farm Rd, New Brunswick, New Jersey, 08901, USA
Keywords:
molecular phylogenetics
morphometrics
Gentianaceae
neotropics
species complex.
Presentation Type: Poster:Posters for Sections
Session: 48-191
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM
Abstract ID:523 |
