View photos of the medicinal plant Grindelia nuda ssp. aphanactis (Gumweed), profiled in Medicinal Plants of the Western Mountain States.

A passage from Medicinal Plants of the Western Mountain States:

Grindelia’s best kept secret is its healing activity on Poison ivy rashes. A century and a half ago, a lotion made by diluting the fluidextract with water (or the fresh plant poultice) was considered a nearly fool–proof application for the condition. Today it still preforms.