ground-ivy vs gypsyweed

ground-ivy

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

gypsyweed

noun
  • Speedwell, Veronica officinalis. 

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