Castilleja angustifolia var. flavescens is common where Wyoming big sagebrush is abundant along the Sand Draw Road (Highway 135) south of Riverton towards Sweetwater Station. This site lies below Beaver Rim, Wind River Basin, Fremont County, Wyoming. Castilleja angustifolia is notably rare to mostly absent on the rangeland side of the fence where spring grazing appears to be somewhat common. The road right-of-way thus protects the Wyoming big sagebrush steppe from overgrazing and thus promotes native perennial forb diversity, which includes the partially parasitic forbs. Variety flavescens is typically highly variable in color with inflorescences being mostly shades of pale pinks to magentas and occasional individuals with bright red inflorescences. Corollas with a long galea projected well above the lower corolla lip (by over 1 cm on average) is in part diagnostic of Castilleja angustifolia.