Taxonomy of Cyphomeris (Nyctaginaceae) based on multivariate analysis of geographic variation
Mahrt, M.; Spellenberg, R.
SIDA Contributions to Botany 16(4): 679-697
The two species of Cyphomeris (Nyctaginaceae) occur in arid regions of central southern North America. Historically, C. gypsophiloides (Mart. and Gal.) Standl., the more widespread, consisted of two subspecies. The other, C. crassifolia (Standl.) Standl., is restricted to the eastern margin of the range of the genus.