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Close up of branches filled with yellow flowers. This flowering tree has bark covered with thorns and grows to 20 feet tall. Located in urban desert gardens of Arizona. Cerium Parkinsonni. Parkinsonia florida is now considered the accepted name and Cercidium floridum a synonym. Parkinsonia aculeata is a species of perennial flowering tree in the pea family,Fabaceae. Common names include palo verde,Mexican palo verde,Parkinsonia,Jerusalem thorn,jelly bean tree,palo de rayo,and retama.