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 Download Free Image
  Format: PNG
  Resolution: 512x512
  Size: 219.0KB
  Downloads: 194
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  Japanese Flowering Cherry HD Free Photo PNG
  Format: PNG
  Resolution: 932x720
  Size: 218.0KB
  Downloads: 194
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  Falling Leaf HQ Image Free PNG
  Format: PNG
  Resolution: 545x472
  Size: 179.7KB
  Downloads: 193
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  Green Energy Free Clipart HQ
  Format: PNG
  Resolution: 512x512
  Size: 11.1KB
  Downloads: 193
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  Green Energy HD Free Photo PNG
  Format: PNG
  Resolution: 874x525
  Size: 36.3KB
  Downloads: 193
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  Jasmine Garland Free Clipart HD
  Format: PNG
  Resolution: 600x600
  Size: 141.9KB
  Downloads: 192
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  Gardening Free Transparent Image HQ
  Format: PNG
  Resolution: 512x512
  Size: 17.3KB
  Downloads: 192
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  Ground Free Photo PNG
  Format: PNG
  Resolution: 1164x596
  Size: 42.4KB
  Downloads: 192
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  Soap Bubbles HD Download HD PNG
  Format: PNG
  Resolution: 500x500
  Size: 78.5KB
  Downloads: 191
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  Green Energy HQ Image Free PNG
  Format: PNG
  Resolution: 3000x3000
  Size: 1.1MB
  Downloads: 191
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  Dandelion Image Free Download PNG HQ
  Format: PNG
  Resolution: 500x512
  Size: 47.3KB
  Downloads: 191
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  Icicles PNG File HD
  Format: PNG
  Resolution: 900x476
  Size: 180.6KB
  Downloads: 190
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  Icicles Image Free Download Image
  Format: PNG
  Resolution: 6126x2538
  Size: 2.2MB
  Downloads: 190
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  Jasmine Garland Free Download PNG HQ
  Format: PNG
  Resolution: 480x800
  Size: 252.9KB
  Downloads: 190
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  Jasmine Garland HD Image Free PNG
  Format: PNG
  Resolution: 600x800
  Size: 241.1KB
  Downloads: 190
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  Green Energy Picture HD Image Free PNG
  Format: PNG
  Resolution: 2400x2400
  Size: 58.3KB
  Downloads: 189
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  Falling Petals Photos PNG Image High Quality
  Format: PNG
  Resolution: 852x480
  Size: 100.3KB
  Downloads: 188
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  Yellow Dandelion Photos Download HD PNG
  Format: PNG
  Resolution: 650x820
  Size: 128.8KB
  Downloads: 188
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  Falling Petals HD Download HD PNG
  Format: PNG
  Resolution: 1920x1080
  Size: 523.4KB
  Downloads: 187
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  Gardening Image Free HD Image
  Format: PNG
  Resolution: 432x480
  Size: 267.7KB
  Downloads: 187

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