Simpson, M., & Rebman, J. P. (2021).

Simpson, M.G. & Rebman, J.P. (2021) Research in Boraginaceae: A new variety of Cryptantha maritima, Cryptantha pondii resurrected, and Johnstonella echinosepala transferred back to Cryptantha. Phytotaxa 509: 185–210.

. Phytotaxa, 512(4), 300. https://doi.org/10.11646/phytotaxa.512.4.7