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This category includes the native flora of the Southwestern United States, within the United States, in North America.
- Taxa of the lowest rank are always included. Higher taxa are included only if endemic.
- For the purposes of this category, the "Southwestern United States" is defined in accordance with the World Geographical Scheme for Recording Plant Distributions. That is, the geographic region is defined by the political boundaries of its constituents:
- See also southern adjacent: Category:Flora of Northwestern Mexico.