[1] : 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
see also:
helianthemum helianthemum vulgare helianthemum canadense cretan rockrose cistus creticus ladanum 

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