rattlesnake fern

any of several American grape ferns, especially Botrychium virginianium, having clusters of sporangia resembling the rattles of a rattlesnake.

1805–15, Americanism

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rattlesnake fern

American fern whose clustered sporangia resemble a snake's rattle 
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Example sentences
Ostrich ferns are abundant, while the rattlesnake fern and lady fern are rare.
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