Peganum L. is a genus under the recently separated family Nitrariaceae (Sheahan & Chase 1996). Formerly it used to be included in the family Zygophyllaceae.
The genus has five species, occurring in warm temperate to subtropical regions across the world:
- Sheahan, M. C. & Chase, M. W. (1996). A phylogenetic analysis of Zygophyllaceae R. Br. based on morphological anatomical and rbcL DNA sequence data. Bot. J. Linn. Soc. 122: 279-300