Usage History of 'heterospory'

The following chart shows how frequently 'heterospory' appeared in printed materials over time. For example, the word 'heterospory' occurred 4 times in books in 1887 and 107 times in 2008. From 1887 to 2008, the word 'heterospory' was used a total of 13,178 times in books scanned by Google. See Reference: Google Ngram project.

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