Clematis virginiana vs devil's darning needle

Clematis virginiana

devil's darning needle

noun

  • A dragonfly. 

  • Clematis virginiana, a vine native to the United States. 

  • A stick insect. 

  • A cranefly. 

How often have the words Clematis virginiana and devil's darning needle occurred in a corpus of books? (source: Google Ngram Viewer )