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 Energy Image Free Download Image
  Format: PNG
  Resolution: 559x565
  Size: 405.3KB
  Downloads: 211
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  Green Energy HQ Image Free PNG
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  Green Energy HD Free Photo PNG
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  Resolution: 874x525
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  Downloads: 193
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  Resolution: 600x564
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  Downloads: 219
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  Size: 49.1KB
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  Green Energy Picture HD Image Free PNG
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  Size: 58.3KB
  Downloads: 189
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  Green Energy Free PNG HQ
  Format: PNG
  Resolution: 576x218
  Size: 10.8KB
  Downloads: 216
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  Green Energy Images Free Download Image
  Format: PNG
  Resolution: 558x557
  Size: 71.7KB
  Downloads: 202
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  Ground Photos PNG Free Photo
  Format: PNG
  Resolution: 600x252
  Size: 221.3KB
  Downloads: 223
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  Ice Cube HQ Image Free PNG
  Format: PNG
  Resolution: 2000x1050
  Size: 720.2KB
  Downloads: 210
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  Colored Dandelion Image Download HD PNG
  Format: PNG
  Resolution: 792x612
  Size: 12.5KB
  Downloads: 230
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  Colored Dandelion Free Download PNG HD
  Format: PNG
  Resolution: 650x391
  Size: 62.9KB
  Downloads: 202
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  Dandelion Free Download Image
  Format: PNG
  Resolution: 1955x2000
  Size: 444.4KB
  Downloads: 247
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  Dandelion Image Free Download PNG HQ
  Format: PNG
  Resolution: 500x512
  Size: 47.3KB
  Downloads: 191
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  Dandelion Picture Free Clipart HQ
  Format: PNG
  Resolution: 4275x1900
  Size: 461.9KB
  Downloads: 237
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  Yellow Dandelion Download Free HQ Image
  Format: PNG
  Resolution: 894x894
  Size: 796.7KB
  Downloads: 201
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  Yellow Dandelion HD PNG Image High Quality
  Format: PNG
  Resolution: 800x800
  Size: 319.8KB
  Downloads: 183
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  Yellow Dandelion Image Download HD PNG
  Format: PNG
  Resolution: 500x481
  Size: 185.3KB
  Downloads: 218
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  Yellow Dandelion Download Free Image
  Format: PNG
  Resolution: 512x512
  Size: 219.0KB
  Downloads: 194
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  Japanese Flowering Cherry HD Image Free PNG
  Format: PNG
  Resolution: 900x692
  Size: 887.9KB
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