E. oregonum 'Sulphur Form' is listed as an invalid name by RHS

The crushed corm is used as a poultice for boils.

Plants for a Future (2016) at www.plantsforafuture.org.uk http://www.pfaf.org/user/Plant.aspx?LatinName=Erythronium+oregonum

Northern America, Western Canada, British Columbia

Northern America, Northwestern U.S.A., Oregon

Northern America, Southwestern U.S.A., California