guttate vs mottled

guttate

adj
  • Spotted. 

  • Shaped like, or resembling drops. 

verb
  • To exude drops of xylem sap on the edges of leaves. 

mottled

adj
  • Colored in patches; spotted. 

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