A need for a reasonably complete and modern list of vascular plants for the Iowa City vicinity has long been felt in the field botany and taxonomy courses at the State University of Iowa. This annotated list of vascular plants indigenous or naturalized in the county is an attempt to fill that need. It is hoped that the flora will also be useful to other botanists and their students in Johnson County and adjacent areas of Iowa. The writer's field work in Johnson County has extended over a period of nearly six years (1949-1955). In that time he has collected or observed in the county 814 species. In addition to these plants, herbarium specimens of at least 160 other species from the county, collected by B. Shimek, M. P. Somes, M. Linder, A. S. Hitchcock, T. H. Macbride, W. A. Anderson, and others, are deposited in the herbaria at Iowa City and Ames. Although 150 or more additional species have been reported by Somes (1913) and others (Macbride 1897, Fitzpatrick 1899, Pierson 1936), vouchers for them have not been seen by the writer. They are, therefore, excluded from this list.
Proceedings of the Iowa Academy of Science
©1955 Iowa Academy of Science, Inc.
Thorne, Robert F.
"The Flora of Johnson County, Iowa,"
Proceedings of the Iowa Academy of Science, 62(1), 155-196.
Available at: https://scholarworks.uni.edu/pias/vol62/iss1/20