A Preliminary Report on the Marsh and Aquatic Dicotyledonous Flora of Iowa

As a part of the plan to complete a survey of the flora of Iowa, a study of the distribution of marsh and aquatic dicotyledonous phanerogams of the state was undertaken in the fall of 1950. This study, based on the collection in the herbaria of Iowa State College and the State University of Iowa in addition to the limited field experience of the author, included 103 species and varieties of plants representing 60 genera of 25 families. The Scrophulariaceae account for 14 species in 8 genera, Ranunculus is represented by 8 species, Polygonum by 7. Without attempting to show all aspects of the picture it shall be the purpose of this paper to illustrate some of the distribution patterns brought out in the study