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.

  • Cactus Prickle Free Transparent Image HD PNG Image
    Cactus Prickle Free Transparent Image HD
    Format: PNG
    Resolution: 538x918
    Size: 138.9KB
    Downloads: 46
  • Cactus Prickle Download HD PNG Image
    Cactus Prickle Download HD
    Format: PNG
    Resolution: 1001x750
    Size: 375.6KB
    Downloads: 86
  • Cactus Prickle PNG Free Photo PNG Image
    Cactus Prickle PNG Free Photo
    Format: PNG
    Resolution: 895x720
    Size: 339.1KB
    Downloads: 57
  • Cactus Prickle Download HD PNG Image
    Cactus Prickle Download HD
    Format: PNG
    Resolution: 637x916
    Size: 1.0MB
    Downloads: 60
  • Photos Cactus Prickle PNG Image High Quality PNG Image
    Photos Cactus Prickle PNG Image High Quality
    Format: PNG
    Resolution: 895x742
    Size: 562.2KB
    Downloads: 77
  • Cactus Pic Prickle PNG File HD PNG Image
    Cactus Pic Prickle PNG File HD
    Format: PNG
    Resolution: 3323x4757
    Size: 129.7KB
    Downloads: 81
  • Cactus Prickle HD Image Free PNG Image
    Cactus Prickle HD Image Free
    Format: PNG
    Resolution: 1270x1048
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  • Cactus Prickle Free Download PNG HD PNG Image
    Cactus Prickle Free Download PNG HD
    Format: PNG
    Resolution: 600x793
    Size: 353.4KB
    Downloads: 100
  • Cactus Prickle Download HD PNG Image
    Cactus Prickle Download HD
    Format: PNG
    Resolution: 3558x8000
    Size: 3.5MB
    Downloads: 77
  • Prickle Download HQ PNG Image
    Prickle Download HQ
    Format: PNG
    Resolution: 648x504
    Size: 471.5KB
    Downloads: 90
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    Prickle Free Clipart HQ
    Format: PNG
    Resolution: 696x600
    Size: 302.2KB
    Downloads: 56
  • Prickle PNG Download Free PNG Image
    Prickle PNG Download Free
    Format: PNG
    Resolution: 660x500
    Size: 19.8KB
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  • Prickle Download HQ PNG Image
    Prickle Download HQ
    Format: PNG
    Resolution: 720x720
    Size: 174.9KB
    Downloads: 81
  • Prickle Free Clipart HD PNG Image
    Prickle Free Clipart HD
    Format: PNG
    Resolution: 681x947
    Size: 100.8KB
    Downloads: 66
  • Photos Prickle Download HD PNG Image
    Photos Prickle Download HD
    Format: PNG
    Resolution: 1200x1678
    Size: 121.9KB
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  • Pic Prickle Free HQ Image PNG Image
    Pic Prickle Free HQ Image
    Format: PNG
    Resolution: 541x487
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  • Prickle HD Image Free PNG Image
    Prickle HD Image Free
    Format: PNG
    Resolution: 1281x295
    Size: 98.4KB
    Downloads: 73
  • Prickle Free Clipart HQ PNG Image
    Prickle Free Clipart HQ
    Format: PNG
    Resolution: 1037x916
    Size: 81.6KB
    Downloads: 51
  • Prickle Free Clipart HD PNG Image
    Prickle Free Clipart HD
    Format: PNG
    Resolution: 774x1024
    Size: 786.4KB
    Downloads: 69

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