[Wikipedia] Limited Range, Description, Larval Host: Asclepias albicans is a species of milkweed known by the common names whitestem milkweed and wax milkweed. It is native to the Mojave and Sonoran Deserts of California, Arizona, and Baja California. This is a spindly erect shrub usually growing 1 to 3 meters (3+1⁄2 to 10 feet) tall,[1] but known to approach 4 metres (13 feet). The sticklike branches are mostly naked, the younger ones coated in a waxy residue and a thin layer of woolly hairs. The leaves are ephemeral, growing in whorls of three on the lower branches and falling off after a short time. Asclepias albicans is a larval host for the monarch butterfly and the queen butterfly. (link added by Mary Ann Machi)