Schoenocrambe linifolia is a species of flowering plant in the mustard family known by the common names flaxleaf plainsmustard, skeleton mustard, and Salmon River plains-mustard. It is native to western North America, where it can be found from British Columbia east of the Cascade Range to Saskatchewan in Canada and south to Arizona and New Mexico in the United States. An "extremely common" plant, it is most abundant in the Columbia, Great, and Colorado Basins.