A cactus (plural cacti) belongs to the plant family Cactaceae which comprises of about 127 genera with nearly 1750 known species of the order Caryophyllales. The word "cactus" is derived from Latin and from the Ancient Greek , kaktos which is a name that was originally used by Theophrastus for a spiny plant whose identity is not certain. Cacti can be found in a wide range of shapes and sizes. Most cacti live in habitats that are subjected to at least some drought. Many live in extremely dry environments such as the Atacama Desert which is one of the driest places on earth. Cacti exhibit many adaptations to conserve water. Almost all cacti are succulents which means that they have thickened, fleshy parts adapted to store water. The stem is the only part of most cacti where this vital process takes place, unlike many other succulents. Most species of cacti retain only spines which are highly modified leaves as they have already lost their true leaves. Spines help prevent water loss by reducing air flow close to the cactus and providing some shade as well as defending themselves against herbivores. Enlarged stems carry out photosynthesis in the absence of leaves. Cacti are native to the Americas and range throughout Patagonia in the south to parts of western Canada in the north, except for Rhipsalis baccifera, which also grows in Africa and Sri Lanka.

In this sub category you can download free PNG images: Cactus Nature. In this category "Cactus" we have 79 free PNG images with transparent background.

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  Cactus File
  Format: PNG
  Resolution: 720x1118
  Size: 361.9KB
  Downloads: 253
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  Cactus Image
  Format: PNG
  Resolution: 1024x1365
  Size: 300.6KB
  Downloads: 263
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  Vector Plant Cactus PNG Download Free
  Format: PNG
  Resolution: 945x1920
  Size: 354.7KB
  Downloads: 81
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  Prickle African PNG Download Free
  Format: PNG
  Resolution: 789x720
  Size: 258.1KB
  Downloads: 83
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  Cactus Prickle Download HD
  Format: PNG
  Resolution: 1001x750
  Size: 375.6KB
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  Cactus Png 11
  Format: PNG
  Resolution: 297x733
  Size: 230.8KB
  Downloads: 587
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  Cactus Prickle Free Download PNG HQ
  Format: PNG
  Resolution: 1070x1918
  Size: 2.6MB
  Downloads: 98
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  Prickle Free Clipart HD
  Format: PNG
  Resolution: 774x1024
  Size: 786.4KB
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  Tropical Photos Plant Cactus Vector
  Format: PNG
  Resolution: 512x512
  Size: 21.6KB
  Downloads: 44
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  Cactus Pic Prickle PNG File HD
  Format: PNG
  Resolution: 3323x4757
  Size: 129.7KB
  Downloads: 81
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  Prickle Free Clipart HD
  Format: PNG
  Resolution: 681x947
  Size: 100.8KB
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  Tropical Plant Cactus Vector Free HQ Image
  Format: PNG
  Resolution: 2270x2811
  Size: 139.6KB
  Downloads: 62
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  Cactus Png 2
  Format: PNG
  Resolution: 1800x3600
  Size: 2.9MB
  Downloads: 488
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  Vector Photos Plant Cactus Green
  Format: PNG
  Resolution: 1200x2413
  Size: 137.5KB
  Downloads: 56
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  Tropical Plant Cactus Vector HQ Image Free
  Format: PNG
  Resolution: 1142x2000
  Size: 338.5KB
  Downloads: 52
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  Cactus Prickle Free Download PNG HD
  Format: PNG
  Resolution: 600x793
  Size: 353.4KB
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  Cactus Prickle Free Transparent Image HD
  Format: PNG
  Resolution: 538x918
  Size: 138.9KB
  Downloads: 46
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  Vector Plant Cactus Free Clipart HD
  Format: PNG
  Resolution: 1969x1969
  Size: 2.0MB
  Downloads: 76
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  Prickle Download HQ
  Format: PNG
  Resolution: 720x720
  Size: 174.9KB
  Downloads: 81
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  Prickle Free Clipart HQ
  Format: PNG
  Resolution: 696x600
  Size: 302.2KB
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