Taxonomic revision of the genus Amaranthus (Amaranthaceae) in Saudi Arabia

WALAA A. HASSAN; NAJLA A. AL-SHAYE; SALMA ALGHAMDI; SHEREEN M. KORANY; DUILIO IAMONICO

doi:10.11646/phytotaxa.576.2.1

Issue: Vol. 576 No. 2: 20 December 2022

Type: Article

Published: 2022-12-20

DOI: 10.11646/phytotaxa.576.2.1

Page range: 135-157

Abstract views: 57

PDF downloaded: 1

**Taxonomic revision of the genus Amaranthus (Amaranthaceae) in Saudi Arabia**

WALAA A. HASSAN⁺⁻
NAJLA A. AL-SHAYE⁺⁻
SALMA ALGHAMDI⁺⁻
SHEREEN M. KORANY⁺⁻
DUILIO IAMONICO⁺⁻

Botany and Microbiology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt

Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia

Ce.R.S.I.Te.S., University of Rome Sapienza, viale XXIV Maggio 7, 04100-Latina, Italy

Amaranthus aliens Asia flora morphology new record nomenclatural change typification Eudicots

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Abstract

A taxonomic revision of the genus Amaranthus (Amaranthaceae) in Saudi Arabia, based on both field surveys and examination of harbarium specimens, is here presented. Collected exsiccata are kept the Herbaria PNUH and RO. An extensive literature was also analysed. Sixtheen non-hybrid taxa (twelve species) are recognized. Data about nomenclature (accepted names, main synonyms, and types), morphology, chromosome number, chorology (for native taxa) or alien status (for exotic taxa), occurrence in Saudi Arabia, ecology (preferential habitat, phenology, elevation), and taxonomic annotations are provided for each taxon. A diagnostic key is proposed. Four taxa (A. graecizans subsp. graecizans, A. graecizans subsp. sylvestris, A. graecizans subsp. thellungianus, and A. sparganicephalus) are native, whereas the other ones are to be considered aliens. A. dubius and A. blitoides var. blitoides are new for the national flora. Furthermore, the name A. sparganicephalus is neotypified on a specimen deposited at E and a nomenclatural change (A. blitum var. nanus comb. nov.) is proposed.

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