The larger of the yellow Castilleja, it has interesting, dark red stems. It is abundant in upper montane and subalpine meadows, and replaced by its shorter cousin in the alpine. Some sources list C. septentrionalis as a synonym of this species, while others list them as two different species. Since our primary purpose here is to show pretty pictures and get you in the ballpark, we've provided links below so you can read further on the taxonomy debates.