GL says and based on the pictures from swbiodiversity, it's a good possibility as their shots were around this kind of rock as well: Parietaria hespera is a species of flowering plant in the nettle family known by the common name rillita pellitory. It is native to the southwestern United States and northwestern Mexico, where it grows in many types of habitat, from coast to desert, dry to moist, and sometimes in disturbed areas.
https://swbiodiversity.org/seinet/taxa/ ... &clid=2949

Parietaria hespera Hinton