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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  Yellow Dandelion Free PNG HQ
  Format: PNG
  Resolution: 624x629
  Size: 167.7KB
  Downloads: 200
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  Yellow Dandelion Free Clipart HQ
  Format: PNG
  Resolution: 936x853
  Size: 781.8KB
  Downloads: 200
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  Ground PNG Image High Quality
  Format: PNG
  Resolution: 1063x203
  Size: 72.7KB
  Downloads: 199
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  Dandelion Image PNG Download Free
  Format: PNG
  Resolution: 600x600
  Size: 89.5KB
  Downloads: 199
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  Dandelion Free Photo PNG
  Format: PNG
  Resolution: 1200x900
  Size: 495.3KB
  Downloads: 199
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  Soap Bubbles Image Free PNG HQ
  Format: PNG
  Resolution: 735x720
  Size: 127.5KB
  Downloads: 198
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  Green Energy Download Image PNG Free Photo
  Format: PNG
  Resolution: 440x720
  Size: 58.0KB
  Downloads: 198
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  Green Energy Download Free Clipart HQ
  Format: PNG
  Resolution: 500x500
  Size: 86.1KB
  Downloads: 198
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  Ground HD PNG Image High Quality
  Format: PNG
  Resolution: 1024x210
  Size: 29.0KB
  Downloads: 198
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  Ice Cube Image HD Image Free PNG
  Format: PNG
  Resolution: 500x347
  Size: 232.5KB
  Downloads: 197
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  Yellow Dandelion Free Clipart HD
  Format: PNG
  Resolution: 2400x2400
  Size: 567.1KB
  Downloads: 197
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  Icicles Download PNG Image High Quality
  Format: PNG
  Resolution: 1200x848
  Size: 528.5KB
  Downloads: 196
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  Gardening Image Free Download PNG HQ
  Format: PNG
  Resolution: 460x346
  Size: 183.8KB
  Downloads: 196
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  Japanese Flowering Cherry HQ Image Free PNG
  Format: PNG
  Resolution: 894x894
  Size: 793.7KB
  Downloads: 196
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  Jasmine Garland HD Download HD PNG
  Format: PNG
  Resolution: 600x600
  Size: 163.1KB
  Downloads: 195
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  Dandelion Download Download Free Image
  Format: PNG
  Resolution: 960x720
  Size: 634.7KB
  Downloads: 195
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  Growing Plant Free Download Image
  Format: PNG
  Resolution: 512x512
  Size: 9.2KB
  Downloads: 194
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  Jasmine Garland Download Free Download Image
  Format: PNG
  Resolution: 600x600
  Size: 185.4KB
  Downloads: 194
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  Green Energy Image Free HQ Image
  Format: PNG
  Resolution: 512x512
  Size: 15.4KB
  Downloads: 194
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  Dandelion Free HD Image
  Format: PNG
  Resolution: 600x600
  Size: 48.5KB
  Downloads: 194

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