swan plant vs wild cotton

swan plant

wild cotton

noun
  • Cotton grass (Eriophorum spp) 

  • Any of several plants of the genera Abutilon and Hibiscus, especially Hibiscus moscheutos 

  • Any of the cultivated cottons that have escaped and established themselves in the wild. 

  • A tall weed, resembling milkweed, with a ball-shaped seed pod, Gomphocarpus fruticosus (syn. Asclepias fruticosa) and Gomphocarpus physocarpus (syn. Asclepias physocarpa). 

  • A shrubby herb (Gossypium thurberi) of southern Arizona and Mexico 

How often have the words swan plant and wild cotton occurred in a corpus of books? (source: Google Ngram Viewer )