Amaranthaceae Juss.
Creators: name: Hassan, Walaa A.
name: Al-Shaye, Najla A.
name: Iamonico, Duilio
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Caryophyllales
Amaranthaceae

description: Diagnostic key for genera of Amaranthaceae s.str. occurring in Saudi Arabia
1. Leaves alternate..................................................................................................................................................................................2
2. Flowers unisexual...............................................................................................................................................................................3
3. Each fertile flower subtended by two modified sterile flowers...................................................... Digera muricata subsp. muricata
3. Fertile flower never subtended by modified sterile flowers............................................................................................. Amaranthus
2. Flowers hermaphrodite.......................................................................................................................................................................4
4. Fruit including one seed; stigma 1, capitate .......................................................................................................................................5
5. Annual herb; tepals 1.00− 1.25 mm long ......................................................................................................... Nothosaerva brachiata
5. Perennial herb; tepals 3.25−4.00 mm long................................................................................................................... Saltia papposa
4. Fruit including 2 or more seeds; stigmas 2−3, linear .............................................................................................................. Celosia
1. Leaves opposite ..................................................................................................................................................................................6
6. Synflorescence in axillary glomerules and/or terminal heads (no terminal spike- or panicle-structures) .........................................7
7. Stigma 1, capitate .......................................................................................................................................................... Alternanthera
7. Stigmas 2, linear .................................................................................................................................................. Gomphrena globosa
6. Synflorescence in terminal spike- or panicle-structures and/or terminal heads.................................................................................8
8. Sterile flowers present ......................................................................................................................... Pupalia lappacea var. velutina
8. Sterile flowers absent .........................................................................................................................................................................9
9. Synflorescence in terminal heads; pseudostaminoids absent ................................................................ Psilotrichum gnaphalobryum
9. Synflorescence in terminal spike-structures; pseudostaminoids present..........................................................................................10
10. Stigmas 2, linear ......................................................................................................................................................................... Aerva
10. Stigma 1, capitate .............................................................................................................................................................................11
11. Pseudostaminoids not fringed................................................................................................................ Psilotrichum gnaphalobryum
11. Pseudostaminoids fringed................................................................................................................................................. Achyranthes
description: Published as part of Hassan, Walaa A., Al-Shaye, Najla A. & Iamonico, Duilio, 2023, A critical inventory of the family Amaranthaceae s. str. in Saudi Arabia, pp. 223-246 in Phytotaxa 626 (4) on page 227, DOI: 10.11646/phytotaxa.626.4.1, http://zenodo.org/record/10212988