Degree Type

Dissertation

Date of Award

2003

Degree Name

Doctor of Philosophy

Department

Botany

First Advisor

Lynn G. Clark

Second Advisor

Robert S. Wallace

Abstract

Phylogenetic analysis of plastid encoded ndhF coding sequences for the Chenopodiaceae-Amaranthaceae alliance reveals a monophyletic Chenopodiaceae-Amaranthaceae clade sister to Achatocarpaceae. The Chenopodiaceae-Amaranthaceae-Achatocarpaceae clade is in turn sister to the Caryophyllaceae, the Chenopodiaceae-Amaranthaceae-Achatocarpaceae-Caryophyllaceae clade forming a separate lineage within order Caryophyllales. The Chenopodiaceae as currently circumscribed is paraphyletic and the alliance breaks into a polytomy of four major clades: (i) Amaranthaceae-Polycnemoideae, (ii) Chenopodieae-Atripliceae, (iii) SalicornioideaeSalsoloideae, and (iv) Beteae. Character-state optimizations of morphological characters mapped onto ndhF sequence derived phylogenies reveal phylogenetically significant patterns of character-state distribution. Morphological investigations also revealed a previously undetected branching pattern in the Gomphrenoideae, which is here described, illustrated, and discussed. Morphological analyses of Amaranthus led to the discovery of a previously undescribed species, which is here described and illustrated and its morphological affinities discussed.

DOI

https://doi.org/10.31274/rtd-180813-11233

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu

Copyright Owner

Donald B. Pratt

Language

en

Proquest ID

AAI3085939

File Format

application/pdf

File Size

116 pages

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