A critical inventory of the family Amaranthaceae s. str. in Saudi Arabia Author Hassan, Walaa A. 0000-0001-7605-9058 Botany and Microbiology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt & azmeyw @ gmail. com; https: // orcid. org / 0000 - 0001 - 7605 - 9058 azmeyw@gmail.com Author Al-Shaye, Najla A. 0000-0002-0447-8613 Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia & naaalshaye @ pnu. edu. sa; https: // orcid. org / 0000 - 0002 - 0447 - 8613 naaalshaye@pnu.edu.sa Author Iamonico, Duilio 0000-0001-5491-7568 Department of Environmental Biology, Univeristy of Rome Sapienza, 00185 Rome, Italy & duilio. iamonico @ uniroma 1. it; https: // orcid. org / 0000 - 0001 - 5491 - 7568 duilio.iamonico@uniroma1.it text Phytotaxa 2023 2023-11-28 626 4 223 246 https://phytotaxa.mapress.com/pt/article/download/phytotaxa.626.4.1/51316 journal article 10.11646/phytotaxa.626.4.1 1179-3163 10212988 Diagnostic key for Achyranthes taxa occurring in Saudi Arabia 1. Main stem usually glabrous or glabrescent; abaxial surface of leaves villous, whitish........................................ Achyranthes sicula 1. Main stem pubescent; abaxial surface of leaves glabrous or pubescent (not villous), green.............................................................2 2. Leaf blades rounded to obovate-orbiculate, obtuse to slightly retuse (sometimes abruptly apiculate); tepals 3−4 mm long.............. ........................................................................................................................................................... Achyranthes aspera var. aspera 2. Leaf blades ovate, acuminate; tepals 6−7 mm long .................................................................... Achyranthes aspera var. pubescens