Parkinsonia microphylla (Foothills Palo Verde, Littleleaf Palo Verde)

This craggy, spiny, slow-growing tree occurs in the Southwest on rocky slopes at elevations from 500 to 4000 feet. Lime green stems and branches carry on photosynthesis in the absence of the tiny leaves. Masses of light yellow flowers cover the tree in the spring after the Parkinsonia florida has bloomed. Plant in full sun and provide excellent drainage.