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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  Vine Leaf Grape Free Download PNG HD
  Format: PNG
  Resolution: 2000x1140
  Size: 895.5KB
  Downloads: 77
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  Vine Leaf Grape Free HD Image
  Format: PNG
  Resolution: 1257x875
  Size: 995.8KB
  Downloads: 80
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  Green Leafs Free HD Image
  Format: PNG
  Resolution: 1885x2257
  Size: 82.5KB
  Downloads: 100
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  Green Leafs PNG Download Free
  Format: PNG
  Resolution: 512x384
  Size: 66.9KB
  Downloads: 51
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  Photos Green Leafs Free Transparent Image HQ
  Format: PNG
  Resolution: 1600x1200
  Size: 593.1KB
  Downloads: 49
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  Green Leafs PNG Free Photo
  Format: PNG
  Resolution: 3376x3516
  Size: 3.5MB
  Downloads: 79
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  Green Leafs PNG Free Photo
  Format: PNG
  Resolution: 2572x1662
  Size: 2.7MB
  Downloads: 92
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  Green Organic Leafs Free Photo
  Format: PNG
  Resolution: 820x659
  Size: 498.8KB
  Downloads: 87
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  Green Organic Leafs Free Clipart HQ
  Format: PNG
  Resolution: 670x600
  Size: 467.5KB
  Downloads: 63
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  Green Organic Leafs Free Transparent Image HQ
  Format: PNG
  Resolution: 3528x2225
  Size: 5.5MB
  Downloads: 74
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  Vector Green Leafs Download HQ
  Format: PNG
  Resolution: 1248x1248
  Size: 449.3KB
  Downloads: 76
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  Vector Green Leafs Free Transparent Image HD
  Format: PNG
  Resolution: 2600x1922
  Size: 3.0MB
  Downloads: 72
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  Vector Green Leafs HQ Image Free
  Format: PNG
  Resolution: 512x512
  Size: 124.1KB
  Downloads: 79
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  Leaf Transparent Background
  Format: PNG
  Resolution: 1885x2257
  Size: 181.6KB
  Downloads: 908
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  Green Leaf PNG Free Photo
  Format: PNG
  Resolution: 975x1084
  Size: 322.1KB
  Downloads: 587
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  Green Leaf HD Download HQ PNG
  Format: PNG
  Resolution: 960x403
  Size: 387.5KB
  Downloads: 250
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  Green Leaf Photos HD Image Free PNG
  Format: PNG
  Resolution: 852x480
  Size: 240.3KB
  Downloads: 298
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  Green Leaf Free PNG HQ
  Format: PNG
  Resolution: 800x600
  Size: 605.4KB
  Downloads: 531
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  Green Leaf Picture Free PNG HQ
  Format: PNG
  Resolution: 800x600
  Size: 18.5KB
  Downloads: 360
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  Green Leaf Image Free Photo PNG
  Format: PNG
  Resolution: 636x720
  Size: 461.2KB
  Downloads: 405

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