Botanical Poison Ivy Antidote?

[Keith Robison]

Any help on this would be appreciated.  It is long-standing lore
in the camping world that the juice of jewelweed* (a wild impatiens)
is an antidote for poison ivy.  Does anyone know of _any_ 
scientific study which has attempted to prove/disprove this claim
or (if true) determine the mechanism.


	* called such because of the silvery appearance of the
	  leaves.  Also known as touch-me-not, for the exploding
	  seedpods characteristic of impatiens.  


Thanks, (and apologies for the common names -- don't have a
	 Peterson's guide here).


Keith Robison
Harvard University
Program in Biochemistry, Molecular, Cellular, and Developmental Biology

robison at ribo.harvard.edu