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POWO follows these authorities in synonymising this name:
Flora of North America Editorial Committee (2019). Flora of North America North of Mexico 17: 1-737. Oxford University Press, New York, Oxford. [Cited as Castilleja septentrionalis.]
This name was accepted following an alternative taxonomy by these authorities:
Ackerfield, J. (2015). Flora of Colorado: 1-818. BRIT Press. [Cited as Castilleja sulphurea.]
Allred, K.W. (2012). Flora Neomexicana, ed. 2, 1: 1-599. Range Science Herbarium, Las Cruces, New Mexico. [Cited as Castilleja sulphurea.]
Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne. [Cited as Castilleja sulphurea.]
Larson, J., Reif, B., Nelson, B.E. & Hartman, R.L. (2014). Floristic studies in North Central New Mexico, U.S.A. the Sange de Cristo mountains. Journal of the Botanical Research Institute of Texas 8: 271-303. [Cited as Castilleja sulphurea.]
Other Kew resources that provide information on this taxon: