This paper is an annotated checklist of the aquatic and wetland ferns, fern allies, and dicotyledons of Iowa and is based primarily on published floristic surveys. For each species, information about its habitat, distribution, synonomy, and frequency of occurrence is provided, plus a distribution map. A total of 9 ferns, 6 fern allies, and 262 dicotyledons are considered aquatic or wetland species in Iowa
