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Evolution and systematics of Chelonanthus (Gentianaceae)
Descriptive
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Text
TitleInfo
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Title
Evolution and systematics of Chelonanthus (Gentianaceae)
SubTitle
PartName
PartNumber
NonSort
Identifier
ETD_1385
Identifier
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051029
Language
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LanguageTerm
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(type = code)
eng
Genre
(authority = marcgt)
theses
Subject
(ID = SBJ-1);
(authority = RUETD)
Topic
Plant Biology
Subject
(ID = SBJ-2);
(authority = ETD-LCSH)
Topic
Gentianaceae--Evolution
Subject
(ID = SBJ-3);
(authority = ETD-LCSH)
Topic
Gentianaceae--Morphology
Abstract
Chelonanthus is a widespread and common neotropical angiosperm genus in the tribe Helieae (Gentianaceae), a group known for its high morphological and ethnobotanical diversity. This genus has been riddled with taxonomic confusion for the last 150 years, and this is the first detailed study ever published on its morphology, evolution, and speciation. Molecular and morphology-based phylogenies of the tribe Helieae reveal a polyphyletic condition with Chelonanthus divided into two strongly separated lineages, one containing the purple-flowered type species Chelonanthus purpurascens and the other containing all other species, which have green to white corollas. This green-white corolla clade contains the most common and widespread species, Chelonanthus alatus, a polyphyletic species complex composed of six morphological variants. This dissertation sampled all recognized species of Chelonanthus as well as all morphological variation found in Chelonanthus alatus. The analytical tools of phylogenetics (Parsimony and Bayesian Analyses) and morphometrics (Principle Component Analysis) were combined to resolve inter- and intra-generic relationships between Chelonanthus and closely related genera of Helieae as well as define species boundaries within the species complex of Chelonanthus alatus. The presented phylogeny, based on 5S-NTS and ITS data, together with a Principle Component Analysis of morphological characters, supports the need to recircumscribe and rename this polyphyletic genus and segregate four of the six morphotypes of Chelonanthus alatus as four segregate species. Two new species will be described, Chelonanthus hamatus found in the Guayana Highlands of French Guiana and Venezuela and Chelonanthus pterocaulis found in Central America, Trinidad and northeastern South America from Costa Rica to French Guiana. Two typified names associated with the Chelonanthus alatus species complex, Chelonanthus acutangulus and Chelonanthus grandiflorus also will be resurrected. In addition, a new species of the previously monotypic genus Sipapoantha (Helieae) will be described from northeastern Brazil. The new knowledge of this group was included in the floristic treatments of Chelonanthus for the Flora of the Guianas and the Catalogue of Vascular Plants of Bolivia.
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electronic resource
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xii, 167 p. : ill.
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Note
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Ph.D.
Note
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Includes bibliographical references (p. 161-166)
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by Katherine Burke Lepis
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Lepis
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Katherine Burke
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Katherine Burke Lepis
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Struwe
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Karin
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Karin L. Struwe
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White
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James
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Advisory Committee
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James F. White
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French
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James
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Advisory Committee
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James C. French
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Smouse
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Peter
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Advisory Committee
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Peter E. Smouse
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Rutgers University
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degree grantor
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Graduate School - New Brunswick
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OriginInfo
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2009
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2009-01
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NjNbRU
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Title
Rutgers University Electronic Theses and Dissertations
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ETD
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Title
Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
Identifier
(type = doi)
doi:10.7282/T3KW5G8M
Genre
(authority = ExL-Esploro)
ETD doctoral
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The author owns the copyright to this work.
Copyright
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Copyright protected
Availability
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Open
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Non-exclusive ETD license
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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