The saguaro cactus (Carnegiea gigantea) and the ocotillo (Fouquieria splendens) are common on the bajadas, while many of the desert trees found are restricted to dry watercourses; these include paloverde (Parkinsonia), the desert willow (Chilopsis linearis), desert ironwood (Olneya tesota), and smoke trees (Psorothamnus spinosus).