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 Plant Transparent Image PNG Image
    Cactus Plant Transparent Image
    Format: PNG
    Resolution: 315x457
    Size: 170.2KB
    Downloads: 367
  • Cactus Clipart PNG Image
    Cactus Clipart
    Format: PNG
    Resolution: 1204x2255
    Size: 92.0KB
    Downloads: 347
  • Cactus Plant Image PNG Image
    Cactus Plant Image
    Format: PNG
    Resolution: 1499x667
    Size: 834.8KB
    Downloads: 316
  • Cactus Photos PNG Image
    Cactus Photos
    Format: PNG
    Resolution: 774x1024
    Size: 786.4KB
    Downloads: 311
  • Cactus Plant File PNG Image
    Cactus Plant File
    Format: PNG
    Resolution: 400x643
    Size: 328.9KB
    Downloads: 294
  • Cactus Transparent Image PNG Image
    Cactus Transparent Image
    Format: PNG
    Resolution: 999x999
    Size: 130.8KB
    Downloads: 279
  • Cactus Image PNG Image
    Cactus Image
    Format: PNG
    Resolution: 1024x1365
    Size: 300.6KB
    Downloads: 263
  • Cactus File PNG Image
    Cactus File
    Format: PNG
    Resolution: 720x1118
    Size: 361.9KB
    Downloads: 253
  • Crossstitch Succulent Plant Photography Cactaceae Stock PNG Image
    Crossstitch Succulent Plant Photography Cactaceae Stock
    Format: PNG
    Resolution: 1000x1000
    Size: 454.2KB
    Downloads: 241
  • 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 Free Download PNG HQ PNG Image
    Cactus Prickle Free Download PNG HQ
    Format: PNG
    Resolution: 1070x1918
    Size: 2.6MB
    Downloads: 98
  • Vector Photos Plant Cactus Free HQ Image PNG Image
    Vector Photos Plant Cactus Free HQ Image
    Format: PNG
    Resolution: 1499x667
    Size: 834.8KB
    Downloads: 98
  • Vector Plant Cactus Free HD Image PNG Image
    Vector Plant Cactus Free HD Image
    Format: PNG
    Resolution: 512x512
    Size: 196.4KB
    Downloads: 95
  • Vector Plant Cactus Green Free Download PNG HQ PNG Image
    Vector Plant Cactus Green Free Download PNG HQ
    Format: PNG
    Resolution: 512x512
    Size: 142.2KB
    Downloads: 94
  • Prickle Download HQ PNG Image
    Prickle Download HQ
    Format: PNG
    Resolution: 648x504
    Size: 471.5KB
    Downloads: 90
  • Cactus Prickle Download HD PNG Image
    Cactus Prickle Download HD
    Format: PNG
    Resolution: 1001x750
    Size: 375.6KB
    Downloads: 86
  • Vector Plant Cactus Free Download PNG HQ PNG Image
    Vector Plant Cactus Free Download PNG HQ
    Format: PNG
    Resolution: 750x750
    Size: 160.5KB
    Downloads: 86
  • Tropical Plant Cactus Vector Free Transparent Image HD PNG Image
    Tropical Plant Cactus Vector Free Transparent Image HD
    Format: PNG
    Resolution: 1024x780
    Size: 614.8KB
    Downloads: 84
  • Prickle African PNG Download Free PNG Image
    Prickle African PNG Download Free
    Format: PNG
    Resolution: 789x720
    Size: 258.1KB
    Downloads: 83
  • Vector Plant Prickly Cactus Free PNG HQ PNG Image
    Vector Plant Prickly Cactus Free PNG HQ
    Format: PNG
    Resolution: 512x512
    Size: 11.6KB
    Downloads: 82

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