Polk County Extension
Benefits and Dangers of Iowa Plants (.pdf 26-pages)
Seeds, Nuts, and Fruits of Iowa Plants (.pdf 28-pages)
Iowa's Mushrooms and Nonflowering Plants (.pdf 22-pages)
Iowa's Spring Wildflowers (.pdf 22-pages)
Iowa's Summer and Fall Wildflowers (.pdf 26-pages)
Iowa's Trees (.pdf 26-pages)
Iowa's Shrubs and Vines (.pdf 22-pages)
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ISU Extension Initiatives