Nitrophila, Botany [Fortieth Parallel]: 297. 1871 sec. Masson & Kadereit (2013)
Polycnemoideae. Nitrophila consists of four (to eight) species distributed in western North America and South America, and the genus represents a classical example of an amphitropical desert disjunction (Masson & Kadereit 2013). Nitrophila shows leaf anatomical adaptations to physiological drought.