Cistus Creticus

from The Collaborative International Dictionary of English v.0.48

Rockrose \Rock"rose`\, n. (Bot.)
   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}.
      [1913 Webster]