Abstract
Abstract In June and July 1841, Lt. John Charles Fremont of the United States Army Corps of Topographical Engineers led a survey of the lower Des Moines River in the territory of Iowa and the state of Missouri, accompanied by botanist Karl Andreas Geyer. The resulting publication was the earliest to report on the flora of Iowa in any sort of scientific fashion. Fremont described the major plant communities encountered, in the process mentioning 30 species: 24 trees and shrubs of the forest and six herbs of the prairie. Seven herbaceous species not mentioned in the report are documented by specimens in the herbarium of Missouri Botanical Garden.
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