perse vs petunia

perse

adj
  • Dark greyish blue or purple. 

noun
  • A dark blue-gray colour. 

  • A cloth of this colour. 

petunia

adj
  • Of a dark purple colour, like that of some petunia flowers. 

noun
  • Any of the flowering plants of genus Petunia, of which most garden varieties are hybrids. 

  • a homosexual 

  • A dark purple colour, like that of some petunia flowers. 

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