4.4. Amaranthus caudatus L., Sp. Pl. 2: 990. 1753.

Lectotype (designated by Towsend 1974: 10):— Herb. Linn. No. 1117.26 (LINN!, image of the lectotype available at http://linnean-online. org/11652/).

Alien status:― Neophyte, native to South America (Argentina, Bolivia, Ecuador, Peru); it can be considered as casual in Saudi Arabia (Hassan et al. 2022).

Occurrence in Saudi Arabia:― Makkah (Hassan et al. 2022: 149).

Note:― According Iamonico (2023) and the description of this species given by both Chaudhary (1998: 236–237) and Miller & Cope (1996: 288), Saudi Arabian material refers to Amaranthus caudatus s. str.

Specimina visa selecta:― SAUDI ARABIA, Makkah, about 5 km N of Taif, dry, rocky hillside, military base, 1720 m, 11 February 1977, leg. Humbles 100032, det. Johnson (IND0088369!).