Graduate Program

Biological Sciences

Degree Name

Master of Science (MS)

Semester of Degree Completion

2013

Thesis Director

Gordon C. Tucker

Thesis Committee Member

Zhiwei Liu

Thesis Committee Member

Barbara S. Carlsward

Abstract

The genus Galeopsis L. of the family Lamiaceae, also known as hemp-nettle, grows naturally in Europe and Asia, with four species naturalized in North America. The number of real species is in doubt, because of conflict over whether certain taxa are species, subspecies, or synonyms. The genus consists of five to eight taxa. I studied flower and leaf size ratios to clarify the distinctions of taxa in Galeopsis. These data were analyzed statistically, using cluster analysis, Principal Components Analysis (PCA), and Analysis of Variance (ANOVA). The results indicated that although some measurements, such as leaf width in G. angustifolia, separated the species from others of the genus, some other character measurements did not provide such clear distinctions (e.g., leaf width in G. bifida and G. tetrahit).

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