man-of-the-earth vs manroot

man-of-the-earth

noun

  • manroot (Ipomoea leptophylla) 

manroot

noun

  • Ipomoea leptophylla 

  • A flowering plant in the gourd family (Cucurbitaceae), genus Marah, native to western North America. 

  • Ipomoea pandurata 

How often have the words man-of-the-earth and manroot occurred in a corpus of books? (source: Google Ngram Viewer )