Idahoa is a monotypic genus of plants in the mustard family containing the single species Idahoa scapigera, which is known by the common names scalepod and oldstem idahoa. It is native to western North America from British Columbia to California to Montana where it grows generally in mountains and foothills. This is a petite annual herb growing a basal rosette of petioled leaves each one to three centimeters long and smooth or lobed along the edges....
