Usage History of 'polygonum'

The following chart shows how frequently 'polygonum' appeared in printed materials over time. For example, the word 'polygonum' occurred 8 times in books in 1707 and 4,249 times in 2008. From 1707 to 2008, the word 'polygonum' was used a total of 179,037 times in books scanned by Google. See Reference: Google Ngram project.

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