For Chelone
Nelson, A.D. 2019. Chelone. 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.
Nelson, A.D., W.J. Elisens, and D. Benesh. 1998. Notes on chromosome numbers in Chelone (Scrophulariaceae). Castanea 63(2): 183-187.
Pennell, F.W. 1935. The Scrophulariaceae of eastern temperate North America. Academy of Natural Sciences of Philadelphia Monograph No. 1.
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