''Peganum'' L. is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

under the recently separated family

Nitrariaceae Nitrariaceae is a family of flowering plants in the order Sapindales. It comprises four genera, '' Malacocarpus'', '' Nitraria'', ''Peganum'' and '' Tetradiclis'', totalling 19 species. The family's main range is in the arid and semi-arid region ...

. Formerly it used to be included in the family

Zygophyllaceae Zygophyllaceae is a family of flowering plants that contains the bean-caper and caltrop. The family includes around 285 species in 22 genera. Plants in the family Zygophyllaceae may be trees, shrubs, or herbs. They are often found in dry habita ...

Phylogeny and Species

The genus has around five species, occurring in warm temperate to subtropical regions across the world: * ''

Peganum harmala ''Peganum harmala'', commonly called wild rue, Syrian rue, African rue, esfand or espand,Mahmoud OmidsalaEsfand: a common weed found in Persia, Central Asia, and the adjacent areasEncyclopedia Iranica Vol. VIII, Fasc. 6, pp. 583–584. Originall ...

'' L. (

Harmal ''Peganum harmala'', commonly called wild rue, Syrian rue, African rue, esfand or espand,Mahmoud OmidsalaEsfand: a common weed found in Persia, Central Asia, and the adjacent areasEncyclopedia Iranica Vol. VIII, Fasc. 6, pp. 583–584. Originall ...

or Syrian rue) — Mediterranean region east to China * ''

Peganum mexicanum ''Peganum'' L. is a genus under the recently separated family Nitrariaceae. Formerly it used to be included in the family Zygophyllaceae. Phylogeny and Species The genus has around five species, occurring in warm temperate to subtropical regi ...

'' Gray — Mexico * ''

Peganum multisectum ''Peganum'' L. is a genus under the recently separated family Nitrariaceae. Formerly it used to be included in the family Zygophyllaceae. Phylogeny and Species The genus has around five species, occurring in warm temperate to subtropical regi ...

'' (Maxim.) Bobrov — China, Mongolia * ''

Peganum nigellastrum ''Peganum nigellastrum'' (Chinese: 骆驼蒿, luo tuo hao) is a plant species in the genus Peganum. "Peganum nigellastrum is distributed in China (west and west north of Pekin) and east Siberia (near Khyagt village). This species has also been re ...

'' Bunge — China * '' Peganum texanum'' M.E.Jones — southern North America Phylogenetic data suggests the following relationships:

References

Nitrariaceae {{Sapindales-stub