ramson vs wild leek

ramson

noun
  • A plant, Allium ursinum, a wild relative of chives and garlic. 

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 ramson and wild leek occurred in a corpus of books? (source: Google Ngram Viewer )