4.11. Amaranthus tricolor L., Sp. Pl. 2: 989. 1753.

Lectotype (designated by Townsend 1974: 14):— Herb. Linn. No. 1117.7 (LINN!, image of the lectotype available at https://linnean-online.org/11633/).

= Amaranthus melancholicus L., Sp. Pl. 2: 989. 1753. ≡ Amaranthus tricolor var. melancholicus (L.) Lam. & Monnet, Encycl. [J. Lamarck & al.] 1: 115. 1783.

Lectotype (designated by Townsend 1994: 11):— Herb. Linn., No. 1117.4 (LINN!, image of the lectotype available at http://linnean-online. org/11630/).

= Amaranthus tristis L., Sp. Pl. 2: 989. 1753. ≡ Amaranthus tricolor var. tristis (L.) Thell. in Asch. & Graebn., Syn. Mitteleur. Fl. [Ascherson & Graebner] 5: 274. 1914. ≡ Amaranthus tricolor subsp. tristis (L.) Aellen in Hegi, Ill. Fl. Mitt.- Eur. 3(2): 495. 1959.

Lectotype (designated by Iamonico 2014b: 149):— Herb. Linn., No. 1117.11 (LINN!, image of the lectotype available at http://linnean-online.org/11637/).

= Amaranthus mangostanus L., Cent. Pl. I. 32. 1755. ≡ Amaranthus tricolor var. mangostanus (L.) Thell. in Asch. & Graebn. Syn. Mitteleur. Fl. [Ascherson & Graebner] 5: 274. 1914. ≡ Amaranthus tricolor subsp. mangostanus (L.) Aellen, in Hegi, Ill. Fl. Mitt.- Eur. 3(2): 495. 1959.

Lectotype (designated by Iamonico 2014b: 147):— Herb. Linn., No. 1117.10 (LINN!, image of the lectotype available at http://linnean-online.org/11636/).

= Amaranthus polygamus L., Cent. Pl. I. 32. 1755. ≡ Amaranthus tricolor subsp. tristis var. polygamus (L.) Aellen in Hegi, Ill. Fl. Mitt.- Eur. 3(2): 495. 1959.

Lectotype (designated by Iamonico 2014b: 148):— Herb. Linn., No. 1117.9 (LINN!, image of the lectotype available at http://linnean-online.org/11635/).

Alien status:—Neophyte, native to Tropical Asia (Iamonico 2015a).

Occurrence in Saudi Arabia:― In Saudi Arabia only cultivated, according to Miller & Cope (1996: 291), Chaudhary (1998: 238), and Hassan et al. (2022: 140). No specimen was traced.