References

For Cymbalaria

Carnicero, P., L. Sáez, N. Garcia-Jacas, M. Galbany-Casals. 2017. Different speciation types meet in a Mediterranean genus: the biogeographic history of Cymbalaria (Plantaginaceae). Taxon 66: 393-407. Google Scholar

Elisens, W.J. 2019a. Cymbalaria. 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

Pennell, F.W. 1935. The Scrophulariaceae of eastern temperate North America. Academy of Natural Sciences of Philadelphia Monograph No. 1. Google Scholar

Sutton, D.A. 1988. A revision of the tribe Antirrhineae. British Museum (Natural History), Oxford Univ. Press, London. Google Scholar