| http://www.w3.org/ns/prov#value | - The desert changes from the palo verde-saguaro desertscrub of the Arizona Upland (a subdivision of the Sonoran Desert) to the Plains of Sonora (another subdivision), where trees such as desert ironwood (Olneya tesota), palo brea (Cercidium praecox), and tree ocotillo (Fouquieria macdougalii) are common, although columnar cacti are not.
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