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 Free PNG HQ
  Format: PNG
  Resolution: 800x600
  Size: 605.4KB
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  Format: PNG
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  Green Leaf Image Free Photo PNG
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  Resolution: 636x720
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  Green Leaf Picture PNG Download Free
  Format: PNG
  Resolution: 1280x439
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  Size: 3.5MB
  Downloads: 518
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  Green Leaf Free PNG HQ
  Format: PNG
  Resolution: 456x285
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  Downloads: 274
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  Green Leaf Images Free Clipart HD
  Format: PNG
  Resolution: 749x807
  Size: 383.7KB
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  Green Leaf Free PNG HQ
  Format: PNG
  Resolution: 2329x1957
  Size: 2.5MB
  Downloads: 229
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  Growing Plant Free Download Image
  Format: PNG
  Resolution: 512x512
  Size: 16.1KB
  Downloads: 228
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  Growing Plant Free Download Image
  Format: PNG
  Resolution: 512x512
  Size: 9.2KB
  Downloads: 194
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  Growing Plant Download Free Clipart HD
  Format: PNG
  Resolution: 600x574
  Size: 128.5KB
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  Growing Plant HD PNG Free Photo
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  Resolution: 420x205
  Size: 25.4KB
  Downloads: 215
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  Growing Plant Image Free Transparent Image HD
  Format: PNG
  Resolution: 833x576
  Size: 146.1KB
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  Growing Plant Free HQ Image
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  Resolution: 603x993
  Size: 171.1KB
  Downloads: 201
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  Growing Plant Photos PNG Download Free
  Format: PNG
  Resolution: 650x979
  Size: 291.9KB
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  Growing Plant Free HD Image
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  Resolution: 512x512
  Size: 7.2KB
  Downloads: 213
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  Growing Plant Picture Free Transparent Image HD
  Format: PNG
  Resolution: 865x359
  Size: 195.4KB
  Downloads: 223
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  Growing Plant Image Free Download Image
  Format: PNG
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  Growing Plant Picture Free Clipart HQ
  Format: PNG
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  Size: 793.6KB
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  Growing Plant HD Image Free PNG
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