Proc. Biol. Soc. Wash.31: 142. 1918
Phenology: Sporulating summer–fall.
Habitat: Cliffs and rocky slopes, usually on limestone
Elevation: 400–2200 m
Cheilanthes villosa is an apogamous triploid of unknown parentage. Although there are reports of hybridization between C. villosa and C. eatonii (D. B. Lellinger 1985), recent gene exchange is unlikely because both taxa are apogamous in North America. Morphologically intermediate specimens (tentatively called C. pinkavii in T. Reeves 1979) are included here in C. eatonii, pending further study and valid publication of Reeve's epithet.