Pteridium aquilinum (bracken, brake or common bracken), also known as `eagle fern,` is a species of fern occurring in temperate and subtropical regions in both hemispheres. The extreme lightness of its spores has led to its global distribution. Common bracken was first described as Pteris aquilina by the father of taxonomy, Carl Linnaeus, in Vol.....
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http://en.wikipedia.org/wiki/Pteridium_aquilinum
(from the article `bracken`) genus of ferns (Pteridium), the sole species (P. aquilinum) of which is widely distributed throughout the world in temperate and tropical regions. ...
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http://www.britannica.com/eb/a-z/p/128
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