creeping Charlie vs ground-ivy

creeping Charlie

noun
  • Swedish ivy (Plectranthus verticillatus), in the mint family, a popular houseplant 

  • creeping Charlie (Pilea nummulariifolia), a houseplant in the nettle family 

  • ground ivy, Glechoma hederacea 

  • moneywort 

ground-ivy

noun
  • Glechoma hederacea, an aromatic, perennial, evergreen creeper of the mint family Lamiaceae 

How often have the words creeping Charlie and ground-ivy occurred in a corpus of books? (source: Google Ngram Viewer )