[1]
Simpson, M.G. and Kelley, R.B. 2017.

Cryptantha nevadensis var. rigida elevated to species with a new name, C. juniperensis

. Phytotaxa. 295, 3 (Feb. 2017), 227–236. DOI:https://doi.org/10.11646/phytotaxa.295.3.3.