Acmispon rigidus, synonyms Lotus rigidus and Ottleya rigida, is a flowering plant in the pea family (Fabaceae), native to the southwestern United States and northwestern Mexico. It is known as desert lotus or desert rock-pea. It is found in the Mojave Desert and Sonoran Desert.

It is a perennial herbaceous 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.

Acmispon rigidusis 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.[3] It is found on dry slopes and desert dry washes below 6,000 ft above sea level, in Joshua tree woodland, and in pinyon-juniper woodland plant communities.

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