The vascular plants and plant communities observed at Interstate State Park, located in Polk County, on the south side of the city of St. Croix Falls in northwestern Wisconsin are presented. The most commonly encountered plant communities were mesic and dry-mesic hardwood forest. The vascular plant list includes 652 taxa from 118 families, including 35 ferns and fern allies, nine gym-nosperms, and 608 angiosperms. Fifty-nine county records were discovered in the course of the survey as well as two species listed as Threatened, and five as Special Concern, by the State of Wisconsin. These data are presented to document floral composition and to provide a base for future research activities within the park and the region.
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