WordReference Random House Unabridged Dictionary of American English © 2020
moss rose, 
  1. Plant Biologya variety of rose, Rosa centrifolia muscosa, having a mosslike growth on the calyx and stem.
  2. Plant BiologySee  rose moss. 
  • 1725–35

Collins Concise English Dictionary © HarperCollins Publishers::
moss rose n
  1. a variety of rose, Rosa centifolia muscosa, that has a mossy stem and calyx and fragrant pink flowers
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