bracken vs scrubland

bracken

noun
  • An area of countryside heavily populated by this fern. 

  • Any of several coarse ferns, of the genus Pteridium, that form dense thickets; often poisonous to livestock. 

scrubland

noun
  • A plant community characterized by scrub vegetation, consisting of low shrubs, mixed with grasses, herbs, and geophytes. 

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