Forstner, Michael R. J.McHenry, Diana J.2020-07-142020-07-142002-12McHenry, D. J. (2002). Molecular systematics of the Texas genera of Nyctaginaceae (Unpublished thesis). Southwest Texas State University, San Marcos, Texas.https://hdl.handle.net/10877/12062For a family well known for its confusing morphological taxonomy, surprisingly little molecular phylogenetic work has been published for the Nyctaginaceae (four o’clock family). This plant group is important in Texas because it includes the endangered endemic Abronia macrocarpa. Elucidating phylogenetic relationships, especially sister group relationships, offers insight into areas like speciation and character evolution. With endangered taxa, this insight may help guide management strategies. Approximately twelve genera (ca. 68 species) of Nyctaginaceae occur in Texas. A molecular phylogenetic investigation was undertaken to determine the relationships among eleven of these genera. DNA sequences of the ITS nrDNA were used to reconstruct relationships via maximum parsimony, distance, and maximum likelihood methods. Phylogenetic relationships within Tribe Nyctagineae do not agree with any of the current classifications. Other relationships within the family, as well as recommendations for needed taxonomic changes, are discussed.Text126 pages1 file (.pdf)enmolecular systematicsplantsNyctaginaceaeThesis