4.8. Amaranthus hybridus L., Sp. Pl. 2: 990. 1753.

Lectotype (designated by Townsend 1974: 19):— U.S.A. Habitat in Virginia, Herb. Linn. No. 1117.19 (LINN!, image of the lecyotype is available at http://linnean-online.org/11645/).

= Amaranthus chlorostachys Willd., Hist. Amaranth.: 34. 1790.

Lectotype (designated by Iamonico 2016a: 521):— UNSPECIFIED LOCALITY, Hermes s.n. (B-W17521!, image of the lecyotype is available at https://herbarium.bgbm.org/object/BW17521000).

= Amaranthus patulus Bertol., Comment. Itin. Neapol. 19. 1837.

Lectotype (designated by Iamonico 2016a: 525):— ITALY. Campania: Napoli al Pasconcello, Sep 1834, Bertoloni s.n. (BOLO!, image of the lectotype in Iamonico 2016a: Figure 3).

= Amaranthus hybridus L. subsp. hybridus var. erythrostachys Moq., Prodr. [A.P. de Candolle] 13(2): 259. 1849.

Lectotype (designated by Iamonico 2016a: 522):— FRANCE. “ Hort. Tol. ”, 1844, s. c. s.n. (G147762/1!, image of the lectotype available at http://www.ville-ge.ch/musinfo/bd/cjb/chg/adetail.php?id=138993&base=img&lang=en).

Alien status:― Neophyte, native to tropical areas of North and Central America; it can be considered as naturalized in Saudi Arabia (Chaudhary 1998, Hassan et al. 2022).

Occurrence in Saudi Arabia:― Al-Baha, Makkah (Miller & Cope 1996, Al-Eisawi & Al-Ruzayza 2015), Tabuk (Miller & Cope 1996, Aljieddani et al. 2021), Bisha (Abbas et al. 2020), and Taif (Abdullah et al. 2017). No specimen was traced.