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...
Initially the two Arizona state tree palo verdes were the genus Cercidium. That’s the way I learned them and that’s the genus name you’ll...
The genus Asclepias is in the Milkweed family Aclepiadaceae and there are about 30 species of Asclepias found in Arizona from low deserts to...