Acmispon rigidus (formerly Lotus rigidus), shrubby deervetch or desert rock-pea, is a perennial flowering plant in pea family (Fabaceae) found in the Mojave Desert and Sonoran Desert.
It is a perennialherbaceous plant growing to 0.5–1.5 m tall. The leaves are irregularly pinnate or palmate with three or four leaflets, 5–15 mm long. The flowers are yellow, turning red or purple as they age.
Ottleya rigida is found in the southwestern United States (Arizona, California, Nevada and Utah) and in northwestern Mexico. It occurs in the Mojave Desert north to Inyo County, California, and in the Sonoran Desert south to the Baja California Peninsula. It is found on dry slopes and desert dry washes below 6,000 ft above sea level, in Joshua treewoodland, and in pinyon-juniper woodland plant communities.