Atriplex

Atriplex

Synonymy

Atriplex L., Sp. Pl. 1: 1052. 1753, nom. cons., sec. Kadereit & al. (2010)
  • =Atriplex [unranked] Theleophyton Hook.f. in London J. Bot. 6: 279. 1847 syn. sec. Maarten & al. (2014)
  • Theleophyton (Hook.f.) Moq., Prodr. 13(2): 44, 115. 1849 syn. sec. Kühn (1993)
  • =Blackiella Aellen in Bot. Jahrb. Syst. 68: 423. 1938 syn. sec. Kühn (1993)
    • Type: not designated
  • =Pachypharynx Aellen in Bot. Jahrb. Syst. 68: 429. 1938 syn. sec. Kühn (1993)
    • Type: not designated

Content

Notes

Atriplex is the most species-rich genus within Chenopodiaceae with c. 300 species. This cosmopolitan genus comprises annual or perennial herbs, subshrubs and shrubs that are often prominent floristic elements of steppes, semi deserts and coastal habitats (Kadereit & al. 2010). Most species of Atriplex are C4 plants which all belong to one large C4 lineage. Many species of the genus are halophytes and possess salt glands. Ontogenetic studies showed that the two more or less concrescent ‘bracteoles’ that envelope the fruit and that are characteristic of Atriplex are better interpreted as two tepals (Flores-Olvera & al. 2011). The circumscription of Atriplex has changed over time, and several infrageneric classifications have been proposed (Flores & Davis 2001; Kadereit & al. 2010). Recent phylogenetic studies based on molecular data (Kadereit & al. 2010, Zacharias & Baldwin 2010) show that Atriplex in its traditional circumscription is not monophyletic and includes several satellite genera that have been separated in the past. A new infrageneric classification is needed. Previously Atriplex was placed in the tribe Atripliceae. However, because the previous Chenopodieae are paraphyletic to Atripliceae the tribes were merged together by Fuentes-Bazán & al. (2012b). The accepted name of the tribe in the new, monophyletic definition is Atripliceae.