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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  Vector Plant Cactus Green PNG Image High Quality
  Format: PNG
  Resolution: 947x1663
  Size: 215.3KB
  Downloads: 67
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  Pic Prickle Free HQ Image
  Format: PNG
  Resolution: 541x487
  Size: 20.3KB
  Downloads: 66
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  Prickle Free Clipart HD
  Format: PNG
  Resolution: 681x947
  Size: 100.8KB
  Downloads: 66
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  Prickle African PNG Image High Quality
  Format: PNG
  Resolution: 700x490
  Size: 41.4KB
  Downloads: 64
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  Vector Plant Cactus Green Free Transparent Image HD
  Format: PNG
  Resolution: 1200x2925
  Size: 351.6KB
  Downloads: 63
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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 Prickle Download HD
  Format: PNG
  Resolution: 637x916
  Size: 1.0MB
  Downloads: 60
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  Cactus Prickle PNG Free Photo
  Format: PNG
  Resolution: 895x720
  Size: 339.1KB
  Downloads: 57
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  Vector Photos Plant Cactus Green
  Format: PNG
  Resolution: 1200x2413
  Size: 137.5KB
  Downloads: 56
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  Prickle Free Clipart HQ
  Format: PNG
  Resolution: 696x600
  Size: 302.2KB
  Downloads: 56
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  Vector Plant Prickly Cactus HD Image Free
  Format: PNG
  Resolution: 512x512
  Size: 490.9KB
  Downloads: 52
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  Vector Plant Prickly Cactus Free Download Image
  Format: PNG
  Resolution: 512x512
  Size: 37.0KB
  Downloads: 52
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  Tropical Plant Cactus Vector HQ Image Free
  Format: PNG
  Resolution: 1142x2000
  Size: 338.5KB
  Downloads: 52
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  Prickle Free Clipart HQ
  Format: PNG
  Resolution: 1037x916
  Size: 81.6KB
  Downloads: 51
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  Vector Plant Prickly Cactus Free HQ Image
  Format: PNG
  Resolution: 600x600
  Size: 167.4KB
  Downloads: 48
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  Vector Photos Plant Prickly Cactus
  Format: PNG
  Resolution: 720x1118
  Size: 361.9KB
  Downloads: 46
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  Cactus Prickle Free Transparent Image HD
  Format: PNG
  Resolution: 538x918
  Size: 138.9KB
  Downloads: 46
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  Tropical Photos Plant Cactus Vector
  Format: PNG
  Resolution: 512x512
  Size: 21.6KB
  Downloads: 44
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  Prickle African Free Download PNG HD
  Format: PNG
  Resolution: 986x653
  Size: 71.0KB
  Downloads: 44

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