Master's Theses



Degree Name

Master of Science (MS)


Four hundred twenty-seven specimens of vascular plants were collected at seven aquatic sites in 1998 and 1999 in an effort to further elucidate the aquatic flora in Ellis County, Kansas. Of 52 aquatic species collected Alismi triviale Pursh., Callitriche hermaphroditica L., Phyla lanceolata (Michx) Greene., Potamogeton nodosus Poir., Ranunculus longirostris Godr., Tripsacum dactyloides (L.) L., Typha domingensis Pers., Verbena hastata L., and Wollfia columbiana Karst, were previously unreported from Ellis County. A total of 113 species, representing 32 families, were identified and assigned to five major groups of aquatic macrophytes including free-floating, emersed, floating, submersed, and marginal aquatics. Limited analysis of site and specimen data was performed in order to understand observed species richness. Neither linear regression of the species richness against the logarithm of the site area nor species richness against the occurrence of rare species was significantly correlated. Site area and rare species occurrence together with other habitat variables suggest a basis for better understanding the floristic differences between study sites. A modified dichotomous key is provided for assistance in identification of aquatic vegetation of Ellis County.


Joseph Thomasson

Date of Award

Spring 2000

Document Type

Thesis - campus only access


© 2000 Monty Vacura


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