Calystegia peirsonii is a species of morning glory known by the common name Peirson's false bindweed. It is endemic to Los Angeles County, California, occurring at the junction of the San Gabriel Mountains and the Mojave Desert in the vicinity of the Antelope Valley. Calystegia peirsonii is a rhizomatous perennial herb producing low-lying or climbing stems up to 40 centimeters long, and hairless and waxy in texture. The small leaves are up to 2 centimeters long, lobed, and generally triangular in shape. The inflorescence produces flowers at the end of peduncles a few centimeters long, each flower a white morning glory up to 4 centimeters wide.