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 Png Image PNG Image
    Cactus Png Image
    Format: PNG
    Resolution: 538x918
    Size: 138.9KB
    Downloads: 961
  • Cactus Png Image PNG Image
    Cactus Png Image
    Format: PNG
    Resolution: 540x466
    Size: 92.9KB
    Downloads: 933
  • Cactus Png Image PNG Image
    Cactus Png Image
    Format: PNG
    Resolution: 1252x2866
    Size: 1.4MB
    Downloads: 831
  • Cactus Png Image PNG Image
    Cactus Png Image
    Format: PNG
    Resolution: 2112x2045
    Size: 1.3MB
    Downloads: 605
  • Cactus Png Image PNG Image
    Cactus Png Image
    Format: PNG
    Resolution: 1221x1296
    Size: 591.6KB
    Downloads: 601
  • Cactus Png 11 PNG Image
    Cactus Png 11
    Format: PNG
    Resolution: 297x733
    Size: 230.8KB
    Downloads: 587
  • Cactus Png Image PNG Image
    Cactus Png Image
    Format: PNG
    Resolution: 2196x1743
    Size: 1.4MB
    Downloads: 561
  • Cactus Png 9 PNG Image
    Cactus Png 9
    Format: PNG
    Resolution: 900x800
    Size: 459.4KB
    Downloads: 560
  • Cactus Png Image PNG Image
    Cactus Png Image
    Format: PNG
    Resolution: 1070x1918
    Size: 963.1KB
    Downloads: 552
  • Cactus Png 10 PNG Image
    Cactus Png 10
    Format: PNG
    Resolution: 512x512
    Size: 117.6KB
    Downloads: 545
  • Cactus Png 3 PNG Image
    Cactus Png 3
    Format: PNG
    Resolution: 1600x1179
    Size: 1.5MB
    Downloads: 542
  • Cactus Png 7 PNG Image
    Cactus Png 7
    Format: PNG
    Resolution: 1070x1918
    Size: 2.6MB
    Downloads: 542
  • Cactus Png 8 PNG Image
    Cactus Png 8
    Format: PNG
    Resolution: 774x1024
    Size: 786.4KB
    Downloads: 537
  • Cactus Png 5 PNG Image
    Cactus Png 5
    Format: PNG
    Resolution: 538x918
    Size: 461.2KB
    Downloads: 535
  • Cactus Png 2 PNG Image
    Cactus Png 2
    Format: PNG
    Resolution: 1800x3600
    Size: 2.9MB
    Downloads: 488
  • Cactus Png 4 PNG Image
    Cactus Png 4
    Format: PNG
    Resolution: 1024x1365
    Size: 300.6KB
    Downloads: 480
  • Cactus Transparent PNG Image
    Cactus Transparent
    Format: PNG
    Resolution: 512x512
    Size: 125.7KB
    Downloads: 479
  • Cactus Png PNG Image
    Cactus Png
    Format: PNG
    Resolution: 555x1116
    Size: 53.7KB
    Downloads: 463
  • Cactus Plant Clipart PNG Image
    Cactus Plant Clipart
    Format: PNG
    Resolution: 500x500
    Size: 194.6KB
    Downloads: 449
  • Cactus Plant Photos PNG Image
    Cactus Plant Photos
    Format: PNG
    Resolution: 499x684
    Size: 349.2KB
    Downloads: 417

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