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 279797 10.11646/phytotaxa.626.4.1 8ad15f0c-26be-49d2-8e77-4a31b70c2a80 1179-3163 10212988 6.1. Digera muricata (L.) Mart., Nova Acta Phys.-Med. Acad. Caes. Leop.-Carol. Nat. Cur. 13: 285. 1826 subsp. muricata ≡ Achyranthes muricata L., Sp. Pl., ed. 2. 1: 295. 1762. Lectotype (designated by Townsend 1974: 23 ):— Herb. Linn. No. 287.6 ( LINN !, image of the lectotype available at https://linnean-online. org/2889/#?s=0&cv=0). = Achyranthes muricata L., Sp. Pl., ed. 2. 1: 295. 1762. Lectotype (designated by Townsend 1985: 37 ):— Herb. Linn. No. 287.7 ( LINN !, image of the lectotype available at https://linnean-online. org/2890/). = Digera arvensis Forssk., Fl. Aegypt .-Arab.: 65. 1775. Lectotype (designate here): — YEMEN . Wadi Mawr and Wadi Surdud , february 1763 , Forsskål 1229 (C10002189!, image of the lectotype available at https://plants.jstor.org/stable/viewer/10.5555/al.ap.specimen.c10002189); isolectotype : C10002188!, image of the isolectotype available at https://plants.jstor.org/stable/viewer/10.5555/al.ap.specimen.c10002188?page=1. Typification of Digera arvensis :— Forsskål (1775: 65) published Digera arvensis by giving a long and detailed description and the provenance “ Surdud ”, which refers to Wadi Surdud, a sedimentary basin situated in W-Yemen [see also Forsskål (1775 : CVI) who indicated “Ph.” as provenance of D. arvensis , where “Ph.” means “Planites argillacea humida, montibus proprios” ( Forsskål 1775 : CI)]. There are two specimens at C (C10002188, C10002189) bearing a plant collected in Wadi Mawr and Wadi Surdud in february 1763 which are part of the original material used to describe D. arvensis (see also Hepper & Friis 1994 ). We here designate C10002189 (which exhibits more flowers than C10002188) thus matching Forsskål’s description, as the lectotype of the name; the morphology of C10002189 corresponds to that of Digera muricata subsp. muricata (see Townsend 1973 ). C10002188 is a isolectotype . Notes:— Two subspecies are currently recognized under Digera muricata , i.e. subsp. muricata and subsp. trinervis C.C.Towns. which differ by the shape of the leaves (ovate vs . linear) and the number of nerves of the outer tepals (7–12 vs . (1–)3). The specimen, as well as the illustration ( Chaudhary 1998: 247 , Plate 130) we traced for Digera muricata allow to confirm the occurrence in Saudi Arabia of subsp. muricata . Chorology:― Digera muricata subsp. muricata is native to some countries of north-eastern Africa, Madagascar , the Arabian Peninsula, and south Asia ( POWO 2023 ). Occurrence in Saudi Arabia :― Chaudhary (1998: 239) stated that Digera muricata occurs in the “westernsouthwestern region”. We verified its presence only at Makkah (see also Collenette 1999 , Ghazanfar & Fisher 2013 ), whereas Miller & Cope (1996) and Abbas et al. (2020) reported the species in Jazan . Specimina visa selecta:— SAUDI ARABIA . Makkah , In palmetis vallis arabicae Fatme prope Unsert , 12 february 1836 , Schimper 830 (HBG503178!); ibidem (HBG503179!); ibidem (P00606396!); ibidem (MEL2462529!); ibidem (TUB000301!); ibidem (TUB000302!); In valle Fatme , s.d. , Fischer s.n. (M0241424!); ibidem , Fischer 42 (M0241423!); In cultis et palmetis vallis Fatme , s.d. , Fischer 42 (M0241422!).