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                  Wadi Nissah is located about 50 km south of Riyadh City. It lies between 46 ° and 47 ° E and 24 ° 30'N and 24 ° 00'N. It is relatively a large basin, bordered on the northern side by Wadi Hanifah and on the southern side by Wadi Al-Hawtah  and Wadi Al-Ayn. The drainage basin area is about 1800 km2 that covers the catchment area of Wadi Nisah and Wadi Awsat. Western side is bordered by the Tuwaiq Mountains and the eastern side is bordered by Al-Kharj town. The Wadi Nissah and its tributaries are covered by alluvium and sand dunes and are bordered on the north and south by hillocks ranging in height from 100 to 200 feet. Vegetation of the wadi is somewhat sparse, mainly dominated by Acacia raddiana, A. ehrenbergiana, Calotropis procers, Rhazya stricta and Senna italica     

   
Species recorded from Wadi Nissah  
Acanthaceae Blepharis ciliaris
Aizoaceae Aizoon canariense
Amaranthaceae Aerva javanica
Apocynaceae Rhazya stricta
Asclepiadaceae Calotropis procera
  Glossonema variens
  Leptadenua pyrotechnica
  Pergularia tomentosa
Asphodelaceae Asphodelus refractus
  Asphodelus tenuifolius
Boraginaceae Arnebia decumbens
  Arnebia hispidissima
  Heliotropium bacciferum
  Heliotropium digynum
  Moltkiopsis ciliata
  Trichodesma africanum
Capparaceae Capparis spinosa
  Cleome amblyocarpa
  Cleome rupicola
  Dipterygium glaucum
  Maerua crassifolia
Caryophyllaceae Gymnocarpos decander
  Gypsophila capillaris
  Herniaria hirsuta
  Paronychia arabica
  Paronychia robbiaria
  Polycarpaea repens
  Pteranthus dichotomus
  Silene arabicus
  Silene linearis
  Silene villosa
Chenopodiaceae Bassia eriophora
  Bassia muricata
  Chenopodium murale
  Haloxylon salicornicum
  Salsola imbricata
Cistaceae Helianthemum lippii
Compositae Anthemis deserti
  Anvillea garcinii
  Artemisia monosperma
  Artemisia scoparia
  Atractylis arabicus
  Centaurea pseudosinaica
  Echinops erinaceus
  Filago desertorum
  Ifloga spicata
  Koelpinia linearis
  Lactuca saligna
  Launaea capitata
  Launaea mucronata
  Picris babylonica
  Pulicaria glutinosa
  Pulicaria undulata
  Rhanterium epapposum
  Scorzonera musillii
  Senecio glaucus
  Sonchus oleraceus
  Tripleurospermum auriculatum
  Zoegea purpurea
Convolvulaceae Convolvulus austro-aegyptiacus
  Convolvulus buschiricus
  Convolvulus glomeratus
  Convolvulus oxyphyllus ssp. oxycladus
  Convolvulus pilosellifolius
  Seddera latifolia
Cruciferae Anastatica heirochuntica
  Cakile arabica
  Diplotaxis harra
  Eremobium lineare
  Farsetia stylosa
  Morettia parviflora
  Savignya parviflora
  Schimpera arabica
  Zilla spinosa
Cucurbitaceae Citrullus colocynthis
  Cucumis prophetarum
Cyperaceae Cyperus conglomeratus
Ephedraceae Ephedra foliata
Euphorbiaceae Chrozophora tinctoria
  Euphorbia granulata
  Euphorbia retusa
  Ricinus communis
Geraniaceae Erodium laciniatum
  Monsonia nivea

 
Gramineae Andropogon distachyos
  Aristida adscensionis
  Avena fatua
  Cenchrus ciliaris
  Centropodia forsskalii
  Centropodia fragilis
  Chrysopogon plumulosus
  Cutandia memphitica
  Cynodon dactylon
  Eragrostis barrelieri
  Hyparrhenia hirta
  Ochthochloa compressa
  Panicum turgidum
  Pennisetum divisum
  Schismus barbatus
  Stipa capensis
  Stipagrostis drarii
  Stipagrostis plumosa
  Tetrapogon villosus
Labiatae Salvia deserti
  Teucrium oliverianum
  Teucrium polium
Leguminosae Acacia ehrenbergiana
  Acacia gerrardii
  Acacia oerfota
  Acacia raddiana
  Astragalus haurensis
  Astragalus spinosa
  Medicago laciniata
  Senna italica
  Taverniaria aegyptiaca
  Tephrosia purpurea
  Trigonella hamosa
  Trigonella stellata
Malvaceae Malva parviflora
Molluginaceae Gisekia pharnaceoides
Neuradaceae Neurada procumbens
Orobanchaceae Cistanche tubulosa
Plantaginaceae Plantago amplexicaulis
  Plantago boissieri
  Plantago ciliata
  Plantago ovata
Polygonaceae Calligonum comosum
  Emex spinosa
  Rumex vesicarius
Resedaceae Ochradenus baccatus
  Reseda arabica
Rhamnaceae Ziziphus nummularia
Rubiaceae Kohautia caespitosa
  Pterogaillonia calycoptera
Rutaceae Haplophyllum tuberculatum
Scrophulariaceae Sclerocephalus arabicus
  Scrophularia deserti
Solanaceae Lycium shawii
Tiliaceae Corchorus depressus
Umbelliferae Anisosciadium lanatum
Zygophyllaceae Fagonia bruguieri
  Fagonia glutinosa
  Fagonia indica
  Seetzenia lanata
  Tetraena propinqua
  Tribulus inermis
  Tribulus macropterus
  Tribulus terrestris

 

Convolvulus buschiricus

 

 

 

Artemisia scoparia

 

 

 

 

Acacia ehrenbergiana

 

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