1. 
   Aaron's-beard
   Aaron's-beard, name sometimes applied to several plants usually characterized by some beardlike aspect, as the St.-John's-wort because of its many stamens and the Kenilworth ivy because of its threadlike runners. Aaron's-beard cactus is Opuntia leucotricha, a true cactus.
   Found op http://www.infoplease.com/ce6/sci/A0802020.html
   
   

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