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This preliminary list of more than 3,000 species includes only the native plants and those that have been introduced from other sections of this country, or other continents, and have escaped from cultivation, and become naturalized and are now a part of the flora of the state.
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Greene, Wesley, "Plants of Iowa: A Preliminary List of the Native and Introduced Plants of the State, Not under Cultivation" (1907). Iowa Book Gallery. 29.