Manual of Riyadh Plants

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Part 3: Planning checklists for quick reference
453
A Humidity
The relative humidity of the air is important for many of the plants
growing in Riyadh. Gardens or parks with well-irrigated lawn ar-
eas have a high level of evapo-transpiration, which creates suitable
micro-climates for the plants recommended under semi-humid
and very humid.
A extremely arid
Acacia ehrenbergiana , 7 m, yellow................................................................................................................. 22
Acacia gerrardii var. iraquensis , 8-10 m, white, pale yellow.................... 25
Acacia gerrardii var. najdensis , 10 m, pale yellow......................................... 25
Acacia ligulata , 1-5 m, deep yellow.............................................................................................................. 28
Acacia nilotica , 6-9 m, yellow........................................................................................................................................ 29
Acacia saligna , 5-6 m, bright yellow......................................................................................................... 32
Acacia seyal , 12 m, yellow......................................................................................................................................................... 33
Acacia tortilis ssp. raddiana , 12 m, white................................................................................. 34
Acacia tortilis ssp. spirocarpa , 12 m, white......................................................................... 35
Atriplex leucoclada , 0.5 m, pale green............................................................................................... 62
Bassia eriophora , 0.15 m, white............................................................................................................................... 64
Blepharis ciliaris , 0.15-0.3 m, blue.................................................................................................................. 67
Calotropis procera , 2-5 m, pastel white, secondary: pastel
violet, pastel purple......................................................................................................................................................................................... 80
Cercidium floridum , 5-9 m, bright yellow............................................................................ 95
Echinops hussoni , 0.4-0.6 m, blue............................................................................................................. 133
Echinops spinosissimus , 0.7-1 m, white, pastel blue........................ 134
Ficus salicifolia , 6-10 m, pale green...................................................................................................... 153
Heliotropium crispum , 0.5 m, white.................................................................................................. 160
Kalanchoe daigremontiana , 0.5-1.2 m, bright orange, pastel lilac................ 177
Moricandia sinaica , 0.5-0.75 m, pastel pink, olive-green................... 203
Opuntia ficus-indica , 3-5 m, yellow..................................................................................................... 217
Portulaca grandiflora , 0.1-0.15 m, yellow, white, pink, red,
violet, purple, yellow............................................................................................................................................................................. 242
Prosopis alba , 7-10 m, pastel white........................................................................................................ 245
Prosopis chilensis , 7-10 m, light yellow.................................................................................... 246
Prosopis farcta , 0.4-2 m, green, yellow....................................................................................... 247
Prosopis juliflora , 5-15 m, pale yellow......................................................................................... 248
Reseda muricata , 0.4 m, green, yellow......................................................................................... 255
Rhanterium epapposum , 0.4-0.8 m, yellow.................................................................. 256
Rhazya stricta , 1 m, white.................................................................................................................................................... 257
Salvadora persica , 3-7 m, pastel green......................................................................................... 268
Tamarix aphylla , 6-15 m, pale yellow.............................................................................................. 292
Tamarix nilotica , 3-8 m, purple......................................................................................................................... 294
Zilla spinosa , 0.6 m, pale blue, pale violet........................................................................ 318
Ziziphus nummularia , 2 m, yellow.......................................................................................................... 321
A very arid
Acacia ampliceps , 9 m, white.......................................................................................................................................... 20
Acacia cuthbertsonii , 3-5 m, yellow........................................................................................................... 21
Acacia etbaica , 2-12 m, white......................................................................................................................................... 23
Acacia farnesiana , 4-6 m, light yellow................................................................................................. 24
Acacia iteaphylla , 3-4 m, pale yellow...................................................................................................... 26
Acacia karroo , 4-15 m, bright yellow..................................................................................................... 27
Acacia nilotica , 6-9 m, yellow........................................................................................................................................ 29
Acacia pycnantha , 6-10 m, bright yellow................................................................................... 30
Acacia salicina , 10-12 m, pale yellow..................................................................................................... 31
Adenium obesum , 1-6 m, deep pink, secondary: deep white........... 39
Agave americana , 0.8-2 m, light green, secondary:
light yellow...................................................................................................................................................................................................... 40
Agave angustifolia ‘Marginata’ , 0.9 m, yellow............................................................. 41
Agave attenuata , 1.2-1.8 m, light green, secondary: light yellow........ 42
Agave sisalana , 1.2-1.8 m, light green, secondary: light yellow............... 43
Aloe arborescens , 1-3 m, red, dark orange.......................................................................... 48
Aloe vera , 0.6-0.9 m, yellow, orange.......................................................................................................... 49
Aptenia cordifolia , 0.1 m, pink, red............................................................................................................ 54
Asphodelus tenuifolius , 0.15-0.3 m, white............................................................................. 60
Atriplex halimus , 0.5-3 m, pale yellow.............................................................................................. 61
Brachychiton populneus , 10-20 m, light yellow, light red............. 72
Calendula officinalis , 0.3-0.6 m, yellow, orange, brown, red.............. 76
Calligonum comosum , 2-3 m, yellow, white.................................................................. 77
Capparis spinosa , 0.3-1 m, white, purple.................................................................................. 82
Carpobrotus acinaciformis , 0.15 m, pink, lilac, light yellow.................. 85
Cassia italica , 0.5-0.6 m, yellow............................................................................................................................... 88
Casuarina equisetifolia , 10-30 m, light green.............................................................. 90