Found 1 items, similar to Upper Sonoran.
English → English (gcide) Definition: Upper Sonoran Sonoran \So*no"ran\, a. (Biogeography) Pertaining to or designating the arid division of the Austral zone, including the warmer parts of the western United States and central Mexico. It is divided into the Upper Sonoran, which lies next to the Transition zone, and the Lower Sonoran, next to the Tropical. [Webster 1913 Suppl.]