rockrose, n.
A name given to any species of the genus Helianthemum, low shrubs or herbs with yellow flowers, especially the European Helianthemum vulgare and the American frostweed, Helianthemum Canadense. [1913 Webster]
Cretan rockrose,
a related shrub (Cistus Creticus), one of the plants yielding the fragrant gum called ladanum.