Mabry, M. E., Dowdy, R. A., Simpson, L. M., Rebman, J. P., & Simpson, M. G. (2016).
Taxonomy of the winged popcorn flower:
Cryptantha pterocarya
(Boraginaceae)
.
Phytotaxa
,
253
(2), 97–130. https://doi.org/10.11646/phytotaxa.253.2.1