rock·rose /ˈrɑkˌroz/
  岩薔薇
  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.
  Cretan rockrose, a related shrub (Cistus Creticus), one of the plants yielding the fragrant gum called ladanum.
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  rockrose
       n 1: any of numerous varieties of helianthemums having small
            roselike yellow or white or reddish flowers [syn: rock
            rose]
       2: small shrubs of scrub and dry woodland regions of southern
          Europe and North Africa; grown for their showy flowers and
          soft often downy and aromatic evergreen foliage [syn: rock
          rose]