Rock"rose` (?), n. (Bot.) A
name given to any species of the genus Helianthemum, low shrubs
or herbs with yellow flowers, especially the European H.
vulgare and the American frostweed, H. Canadense.
Cretan rockrose, a related shrub (Cistus
Creticus), one of the plants yielding the fragrant gum called
ladanum.