autumn crocus vs sugar palm

autumn crocus

noun
  • especially, Colchicum autumnale. 

  • Any of several species of genus Colchicum that bloom in the Fall 

sugar palm

noun
  • Nypa fruticans (nipa palm) 

  • Borassus flabellifer (palmyra palms) 

  • Cocos nucifera (coconut palm) 

  • Any of various palm species used to produce sugar, including 

  • Caryota urens (fishtail palm, sago palm, toddy palm, wine palm) 

  • Phoenix spp. (date palm) 

  • Corypha elata (buri palm, gebang palm) 

  • especially, Arenga pinnata 

How often have the words autumn crocus and sugar palm occurred in a corpus of books? (source: Google Ngram Viewer )