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Sonoran Basin and Range

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NameColor on MapEPA Code‡
Western Sonoran Mountains81a
Western Sonoran Mountain Woodland and Shrubland81b
Western Sonoran Basins81c
Sand Hills/Sand Dunes81d
Upper Coachella Valley and Hills81e
Imperial/Lower Coachella Valleys81f
Lower Colorado/Lower Gila River Valleys81g
Sonoran Playas81h
Central Sonoran/Colorado Desert Mountains81i
Central Sonoran/Colorado Desert Basins81j
Arizona Upland/Eastern Sonoran Mountains81k
Arizona Upland/Eastern Sonoran Basins81l
Sonoran Lava Fields81m
Gila/Salt Intermediate Basins81n
Middle Gila/Salt River Floodplains81o

† Status: ✓ = Complete ○ = Needs Image … = Incomplete ∅ = Stub Only

This code refers to the US EPA's Level 4 ecoregion codes for the continental U.S., see here.


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About the Sonoran Basin and Range

The Sonoran Basin and Range is part of the Warm Deserts, and extends from the southeasternmost corner of California through much of southwestern Arizona, and, in Mexico, into southeastern Baja California, through much of Sonora and with a small discontinuous piece stretching into Sinaloa.

This region consists of large, flat areas and scattered low mountains. It is hotter than the regions to the north. Winter rainfall is highest in the west, driven by storms moving in from the ocean, whereas summer rainfall is highest in the east, resulting from more southerly storms pushed north and inland as part of the North American monsoon.

Plant Lists & In-Region Search

List Native Plants - List All Plants

Warning! This region extends outside the continental US. We have only built range maps for the portion of plant ranges in the continental US; these lists and searches may thus have major omissions for species which only occur in the portion of this region outside the continental US.


1. Wiken, E., Griffith, G. "North American Terrestrial Ecoregions - Level III", Commission for Environmental Cooperation, (2011) Web.