agapanthus vs lily of the Nile

agapanthus

noun
  • Any member of the genus Agapanthus of flowering plants. 

lily of the Nile

noun
  • Agapanthus praecox, a plant species in the family Alliaceae. 

  • Zantedeschia aethiopica, a plant species in the family Araceae. 

How often have the words agapanthus and lily of the Nile occurred in a corpus of books? (source: Google Ngram Viewer )