Desert Rock Nettle

"The flowers, which appear from spring to early summer, are cream or pale yellow with 5 petals and are 2.5 to 5 cm long. The coarsely serrated leaves are 2 to 6.5 cm long with stinging hairs which are also found on the stems and buds. The plant is round and bushy and is usually between 30 and 60 cm in height and is often found on cliff faces. Desert bighorn sheep feed on the flowers."

Source: here

"Adaptation for Survival: Leaves and stems covered with thousands of small, sharp-pointed poisonous hairs and shorter barbs which catch on animals passing by. Except for various insects and small reptiles, most animal life avoids this plant."

Source: here