References
For Chelone
Nelson, A. 2024. Taxonomy of the Chelone obliqua (Plantaginaceae) polyploid complex. Phytoneuron 2024-80: 1-8. Published 18 December 2024. ISSN 2153 733X Google Scholar
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. Google Scholar
Nelson, A.D., W.J. Elisens, and D. Benesh. 1998. Notes on chromosome numbers in Chelone (Scrophulariaceae). Castanea 63(2): 183-187. Google Scholar
Pennell, F.W. 1935. The Scrophulariaceae of eastern temperate North America. Academy of Natural Sciences of Philadelphia Monograph No. 1. Google Scholar