Freeman 2019. Penstemon. In: Flora of North America Editorial Committee, ed. Flora of North America North of Mexico. Volume 17. Magnoliophyta: Tetrachondraceae to Orobanchaceae. New York, NY: Oxford University Press: 82-202.

Freeman 2019. Penstemon. In: Flora of North America Editorial Committee, ed. Flora of North America North of Mexico. Volume 17. Magnoliophyta: Tetrachondraceae to Orobanchaceae. New York, NY: Oxford University Press: 82-202.

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