4.5. Amaranthus cruentus L., Syst. Nat., ed. 10. 2: 1269. 1759. Lectotype (designated by Townsend 1974: 12):— Herb. Linn. No. 1117.25 (LINN!, image of the lectotype available at http://linnean-online.org/11651/). = Amaranthus flavus L., Syst. Nat., ed. 10. 2: 1269. 1759. Lectotype (designated by Iamonico 2014a: 147):— Herb. Linn. No. 1117.23 (LINN!, image of the lectotype available at http://linnean-online.org/11649/). = Amaranthus paniculatus L., Sp. Pl., ed. 2. 2: 1406. 1763. Lectotype (designated by El Hadidi & El Hadidy 1981: 37):— Herb. Linn. No. 1117.20 (LINN!, image of the lectotype available at http:// linnean-online.org/11646/). = Amaranthus sanguineus L., Sp. Pl., ed. 2. 2: 1407. 1763. Lectotype (designated by Iamonico 2014a: 148):— Herb. Linn. No. 1117.21 (LINN!, image of the lectotype available at http://linnean-online.org/11647/). Alien status:― Neophyte, native to Central America; it can be considered as naturalized in Saudi Arabia (Chaudhary 1998, Hassan et al. 2022). Occurrence in Saudi Arabia:― Hassan et al. (2022: 153) refers the occurrence in Saudi Arabia of Amaranthus cruentus by citing Chaudhary’s Flora of the Kingdom of the Saudi Arabia (Chaudhary 1998). Miller & Cope (1996: 288, 538) reported this species in Jazan nu with doubt. No specimen was traced by us. The sepcies remains doubtful as a member of the national flora.

Published as part of Hassan, Walaa A., Al-Shaye, Najla A. & Iamonico, Duilio, 2023, A critical inventory of the family Amaranthaceae s. str. in Saudi Arabia, pp. 223-246 in Phytotaxa 626 (4) on page 233, DOI: 10.11646/phytotaxa.626.4.1, http://zenodo.org/record/10212988