Poison Ivy

Tall Grass Prairie

Poor-Man's-Pepper

Lepedium virginicum

Also helps with scurvy.

Used as a fresh leaf tea for a poison ivy rash. 

Poor-Man's-Pepper
http://www.illinoiswildflowers.info/weeds/photos/cm_peppergrass2.jpg

Humic Acid
http://1stlighttrading.com/media/wysiwyg/buy-humic-acid.gif

Eastern Deciduous Forest

Yellow Giant Hyssop

Agastache nepetoides

Specifically used only for poison ivy. 

Used leaves in a compound mixture to apply to the rash.

Yellow Giant Hyssop
http://pics.davesgarden.com/pics/2005/02/02/Beanmomma/e95b9b.jpg

Myrcene
http://www.rdchemicals.com/molimg/big/8081.gif