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Baja California desert Mexico
Central Mexican matorral Mexico
Chihuahuan desert Mexico, United States
Colorado Plateau shrublands United States
Columbia Plateau shrublands Canada, United States
Great Basin shrub steppe United States
Gulf of California xeric scrub Mexico
Meseta Central matorral Mexico
Mojave Desert United States
Snake–Columbia shrub steppe United States
Sonoran Desert Mexico, United States
Tamaulipan matorral Mexico
Tamaulipan mezquital Mexico, United States
Wyoming Basin shrub steppe United States