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Beaver were introduced here, then, in a change of policy, removed because they were not truly indigenous..
Leavitt Meadow, South Fork Walker River, Stanislaus NF, CA (1985).
Pampas grass from South America, originally planted by highway officials to stablize roadcuts and landslides, is now a serious pest.
Highway 1 near Lucia, CA (1993).
One of the nastiest of all introduced weed species, star thistle is poisonous to horses.
Sugar Cone Peak SP, near Santa Rosa, CA (1991).