4.10. Amaranthus spinosus L., Sp. Pl. 2: 991. 1753.

Lectotype (designated by Fawcett & Rendle 1914: 103):— Herb. Linn. No. 1117.27 (LINN!, image of the lectotype available at http:// linnean-online.org/11653/).

Alien status:― Neophyte, native to Neotropics; it can be considered as casual in Saudi Arabia (see Chaudhary 1998, Hassan et al. 2022).

Occurrence in Saudi Arabia:― Bisha (Abbas et al. 2020), Jizan (Miller & Cope 1996, Collenette 1999, Al-Turki et al. 2000, Aljieddani et al. 2021). No specimen was traced.