What is "perityle"

Perityle is a genus of flowering plants in the daisy family. They are known generally as rock daisies.

Perityle is a variable genus, with its members sharing few characteristics. They include small herbs to spreading shrubs and most bear yellow or white daisylike flower heads. The fruit is generally a flat seed with thickened margins which may or may not have a pappus or scales. Plants of this genus are native to North and South America.