Egger, M.J., P.F. Zika, B.L. Wilson, R.E. Brainerd, and N. Otting. 2019. Castilleja In Flora of North America Editorial Committee. 2019. Flora of North America north of Mexico. Volume 17, Magnoliophyta: Tetrachondraceae to Orobanchaceae. Oxford Univ. Press, New York, NY. 737 pp.
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