Flickr user, Pfly

The gigantic leaves of devil's club barely hide its sharp thornsĀ  - if you're ever sliding down a mountain slope, this is not a plant to grab. But inside the roots' bark lies medicine for all sorts of evils: native coastal North Americans treated as many as 34 types of ailments with it.

Flora de la Terre

August 31st & September 2nd, 2013: Henna, used since antiquity to dye skin, hair and fingernails, is medicinal, but risky for some.