A leaf is the principal lateral appendage of the stem which is in turn part of a plant. Hence a leave is an organ of a vascular plant. The shoot is formed together by the stem and the leaves. Foliage is a term used for referring leaves collectively. As is one must have often heard, 'autumn foliage'. The characteristic of this plant organ is that it is a dorsoventrally flattened organ, usually borne above the ground, and specialised for its function of photosynthesis. Photosynthesis is the process of converting the intake of carbon dioxide into oxygen. The primary photosynthesis tissue, in most leaves, known as palisade mesophyll, is located on the upper side of the blade or lamina of the leaf. However there are still exceptions, like in some species, including the mature foliage of Eucalypts, palisade mesophyll is present on both sides and these leaves are said to be isobilateral.
Many leaves have a distinct upper surface, also known as adaxial and distinct lower surface called abaxial which differ in colour, the number of stomata ( stomata are the pores present on leaves that intake and output gases), hairiness, the amount and structure of epicuticular wax and other features. When talking about the colour of leaves, they are mostly green, but there are always exceptions.

In this sub category you can download free PNG images: Leaf Nature. In this category "Leaf" we have 290 free PNG images with transparent background.

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  Green Leaf Picture PNG Download Free
  Format: PNG
  Resolution: 1280x439
  Size: 465.9KB
  Downloads: 280
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  Growing Plant Download Free Clipart HD
  Format: PNG
  Resolution: 600x574
  Size: 128.5KB
  Downloads: 229
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  Half Moon Free Clipart HD
  Format: PNG
  Resolution: 512x512
  Size: 19.1KB
  Downloads: 261
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  Green Leaf Free Transparent Image HQ
  Format: PNG
  Resolution: 600x600
  Size: 21.4KB
  Downloads: 298
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  Green Leaf Image Free PNG HQ
  Format: PNG
  Resolution: 948x624
  Size: 351.4KB
  Downloads: 248
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  Icicles Picture Download Free Image
  Format: PNG
  Resolution: 456x400
  Size: 158.9KB
  Downloads: 200
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  Half Moon Photos Free Clipart HQ
  Format: PNG
  Resolution: 600x599
  Size: 65.2KB
  Downloads: 203
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  Growing Plant Image Free Download Image
  Format: PNG
  Resolution: 1614x820
  Size: 393.7KB
  Downloads: 204
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  Jasmine Garland HD Image Free PNG
  Format: PNG
  Resolution: 600x800
  Size: 241.1KB
  Downloads: 190
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  Jasmine Garland Picture Download HQ PNG
  Format: PNG
  Resolution: 600x600
  Size: 183.3KB
  Downloads: 209
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  Leaf Free Download
  Format: PNG
  Resolution: 1376x1600
  Size: 2.3MB
  Downloads: 613
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  Icicles Free Transparent Image HQ
  Format: PNG
  Resolution: 2193x1200
  Size: 3.3MB
  Downloads: 226
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  Jasmine Garland Image Free Clipart HQ
  Format: PNG
  Resolution: 455x717
  Size: 126.5KB
  Downloads: 276
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  Half Moon Free Download Image
  Format: PNG
  Resolution: 1300x1300
  Size: 486.4KB
  Downloads: 302
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  Leaf Transparent Image
  Format: PNG
  Resolution: 1000x983
  Size: 1.4MB
  Downloads: 656
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  Icicles Free Download PNG HQ
  Format: PNG
  Resolution: 6999x2258
  Size: 4.0MB
  Downloads: 220
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  Jasmine Garland Photos PNG File HD
  Format: PNG
  Resolution: 450x600
  Size: 119.5KB
  Downloads: 216
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  Icicles Free HQ Image
  Format: PNG
  Resolution: 2068x5138
  Size: 1.9MB
  Downloads: 183
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  Jasmine Garland Free HD Image
  Format: PNG
  Resolution: 450x600
  Size: 168.4KB
  Downloads: 203
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  Growing Plant Free Download Image
  Format: PNG
  Resolution: 512x512
  Size: 9.2KB
  Downloads: 194

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