An annotated list of the non-native plant species found in eight eastern Wisconsin natural areas and their relative abundances in 1988 is presented. Except for European buckthorn, aliens were scattered and at low densities, several found mainly along trails. The most seriously invaded sites were Sanders Park and Muskego Park, areas with numerous hiking trails and relatively open, oak-dominated canopies.
Leitner, L.A. 1988. Status of alien plant species in eight State NaturalAreas in Eastern Wisconsin. 21(2): 10-19.