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 Transparent
  Format: PNG
  Resolution: 512x512
  Size: 125.7KB
  Downloads: 479
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  Vector Plant Cactus Free Download PNG HQ
  Format: PNG
  Resolution: 750x750
  Size: 160.5KB
  Downloads: 86
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  Vector Photos Plant Cactus Free HQ Image
  Format: PNG
  Resolution: 1499x667
  Size: 834.8KB
  Downloads: 98
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  Cactus Png 4
  Format: PNG
  Resolution: 1024x1365
  Size: 300.6KB
  Downloads: 480
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  Crossstitch Succulent Plant Photography Cactaceae Stock
  Format: PNG
  Resolution: 1000x1000
  Size: 454.2KB
  Downloads: 241
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  Cactus Png Image
  Format: PNG
  Resolution: 538x918
  Size: 138.9KB
  Downloads: 961
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  Vector Plant Cactus Green Free Download PNG HQ
  Format: PNG
  Resolution: 512x512
  Size: 142.2KB
  Downloads: 94
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  Cactus Photos
  Format: PNG
  Resolution: 774x1024
  Size: 786.4KB
  Downloads: 311
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  Cactus Png 9
  Format: PNG
  Resolution: 900x800
  Size: 459.4KB
  Downloads: 560
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  Cactus Png
  Format: PNG
  Resolution: 555x1116
  Size: 53.7KB
  Downloads: 463
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  Prickle HD Image Free
  Format: PNG
  Resolution: 1281x295
  Size: 98.4KB
  Downloads: 73
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  Cactus Png 5
  Format: PNG
  Resolution: 538x918
  Size: 461.2KB
  Downloads: 535
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  Prickle African Download HD
  Format: PNG
  Resolution: 1207x1196
  Size: 1.0MB
  Downloads: 72
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  Cactus Plant Photos
  Format: PNG
  Resolution: 499x684
  Size: 349.2KB
  Downloads: 417
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  Prickle Pic African Download HD
  Format: PNG
  Resolution: 660x500
  Size: 21.3KB
  Downloads: 68
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  Photos Prickle African Free Download PNG HQ
  Format: PNG
  Resolution: 512x512
  Size: 26.1KB
  Downloads: 72
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  Prickle African HD Image Free
  Format: PNG
  Resolution: 512x512
  Size: 18.8KB
  Downloads: 79
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  Prickle African Free Download PNG HD
  Format: PNG
  Resolution: 986x653
  Size: 71.0KB
  Downloads: 44
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  Vector Plant Cactus Free HD Image
  Format: PNG
  Resolution: 512x512
  Size: 196.4KB
  Downloads: 95
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  Tropical Plant Cactus Vector Free Photo
  Format: PNG
  Resolution: 2235x3197
  Size: 221.0KB
  Downloads: 79

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