Noun rock penstemon has 1 sense
  1. rock penstemon, cliff penstemon, Penstemon rupicola - one of the West's most beautiful wildflowers; large brilliant pink or rose flowers in many racemes above thick mats of stems and leaves; ledges and cliffs from Washington to California
    --1 is a kind of wildflower, wild flower
    --1 is a member of Penstemon, genus Penstemon
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