Richea pandanifolia vs grass tree

Richea pandanifolia

grass tree

noun
  • Dasylirion longissimum (family Asparagaceae, Mexican grass tree) 

  • Richea pandanifolia (family Ericaceae, giant grass tree). 

  • Any of various small trees of the family Xanthorrhoeaceae (especially of the genus Xanthorrhoea), having a thick trunk crowned with a dense tuft of pendulous, grass-like leaves. 

  • A New Zealand shrub of the genus Dracophyllum, that grows up to 12 m high and found throughout in drier climates and at higher altitudes, with slender erect or spreading branches. Rigid, leathery grass-like leaves are usually crowded towards the tip of the branchlets. Also called spiderwood. 

  • Dracophyllum (family Ericaceae), a genus of about 100 species. 

How often have the words Richea pandanifolia and grass tree occurred in a corpus of books? (source: Google Ngram Viewer )