I was sort of right, but mainly wrong about poison ivy’s Latinized name. The species found in Arizona is Toxicodendron rydbergii, formerly Rhus radicans...
Many years ago while driving the dirt road between Klondyke and Pima, Arizona I rounded a curve and and almost crashed into an Apache...
A hike in the nearby sky islands has Petey excitedly stumbling over plant names while giggling and jabbering away. Better listen.