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Re:Only 3 northern white rhinos left on Earth by dikdik on Monday November 23, 2015 @05:28AM (#10613797)
Lots of things are farmed that are not patented.

From your own source, "The identity of silphium is highly debated."

-_-

Re:Only 3 northern white rhinos left on Earth by danieltillett on Monday November 23, 2015 @06:13AM (#10613943)
That is because silphium was exploited to extinction, much like the rhino.