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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  Japanese Flowering Cherry HD Free Photo PNG
  Format: PNG
  Resolution: 932x720
  Size: 218.0KB
  Downloads: 194
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  Japanese Flowering Cherry Image Free Clipart HD
  Format: PNG
  Resolution: 682x700
  Size: 674.5KB
  Downloads: 242
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  Japanese Flowering Cherry Image HD Image Free PNG
  Format: PNG
  Resolution: 650x651
  Size: 337.7KB
  Downloads: 309
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  Japanese Flowering Cherry Picture PNG Download Free
  Format: PNG
  Resolution: 950x897
  Size: 233.4KB
  Downloads: 310
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  Japanese Flowering Cherry Download Free Image
  Format: PNG
  Resolution: 2714x2714
  Size: 2.4MB
  Downloads: 337
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  Japanese Flowering Cherry Images Download Free Image
  Format: PNG
  Resolution: 1600x800
  Size: 300.3KB
  Downloads: 269
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  Twitter Computer Icons Free PNG HQ
  Format: PNG
  Resolution: 1024x1024
  Size: 40.8KB
  Downloads: 210
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  Grape Vine Leaf Art PNG Download Free
  Format: PNG
  Resolution: 512x160
  Size: 67.1KB
  Downloads: 93
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  Grape Vine Leaf Art PNG File HD
  Format: PNG
  Resolution: 708x750
  Size: 198.2KB
  Downloads: 68
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  Vine Leaf Grape Bunch Free Clipart HQ
  Format: PNG
  Resolution: 500x488
  Size: 298.1KB
  Downloads: 86
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  Vine Leaf Grape Bunch Free HD Image
  Format: PNG
  Resolution: 886x1135
  Size: 204.2KB
  Downloads: 52
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  Vine Leaf Grape Bunch Free Clipart HQ
  Format: PNG
  Resolution: 1559x771
  Size: 472.3KB
  Downloads: 93
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  Fresh Green Leafs PNG Free Photo
  Format: PNG
  Resolution: 1087x988
  Size: 148.9KB
  Downloads: 91
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  Fresh Green Leafs Free Transparent Image HQ
  Format: PNG
  Resolution: 1369x1049
  Size: 1.4MB
  Downloads: 80
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  Vine Leaf Grape Free Clipart HD
  Format: PNG
  Resolution: 1321x1787
  Size: 575.0KB
  Downloads: 97
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  Vine Leaf Grape Free Transparent Image HD
  Format: PNG
  Resolution: 590x346
  Size: 90.7KB
  Downloads: 98
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  Green Leafs Free Transparent Image HD
  Format: PNG
  Resolution: 796x1456
  Size: 290.9KB
  Downloads: 48
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  Green Leafs Free HQ Image
  Format: PNG
  Resolution: 1600x1138
  Size: 1.6MB
  Downloads: 54
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  Green Organic Leafs Free Download PNG HD
  Format: PNG
  Resolution: 1006x366
  Size: 280.7KB
  Downloads: 48
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  Green Organic Leafs Download Free Image
  Format: PNG
  Resolution: 1700x1246
  Size: 2.0MB
  Downloads: 90

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