bear garlic vs wild leek

bear garlic

noun
  • A wild plant related to chives; ramsons, Allium ursinum 

wild leek

noun
  • A perennial wild onion native to eastern North America, Allium tricoccum, with a cluster of ovoid bulbs and large oblong elliptical leaves. 

  • A wild onion native to southern Europe and western Asia, cultivated and consequently naturalized in many other places, Allium ampeloprasum. 

How often have the words bear garlic and wild leek occurred in a corpus of books? (source: Google Ngram Viewer )