^ MacMahon JA (1997) Deserts, National Audubon Society Nature Guides, AA Knopf Inc.^ Biota of North America Program 2014 county distribution map.Agricultural Research Service, United States Department of Agriculture. ^ Flora of North America: Gaillardia pulchella Fougeroux, 1788. National Audubon Society Field Guide to North American Wildflowers: Western Region (rev ed.).
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