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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  Gardening Images Free Download PNG HQ
  Format: PNG
  Resolution: 514x1024
  Size: 418.5KB
  Downloads: 186
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  Green Energy Free HD Image
  Format: PNG
  Resolution: 875x611
  Size: 42.3KB
  Downloads: 186
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  Yellow Dandelion Free HQ Image
  Format: PNG
  Resolution: 509x600
  Size: 306.4KB
  Downloads: 185
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  Ice Cube Free Download PNG HD
  Format: PNG
  Resolution: 623x431
  Size: 402.0KB
  Downloads: 184
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  Colored Dandelion Image HQ Image Free PNG
  Format: PNG
  Resolution: 600x600
  Size: 112.7KB
  Downloads: 184
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  Icicles Free HQ Image
  Format: PNG
  Resolution: 2068x5138
  Size: 1.9MB
  Downloads: 183
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  Gardening HQ Image Free PNG
  Format: PNG
  Resolution: 516x523
  Size: 97.9KB
  Downloads: 183
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  Yellow Dandelion HD PNG Image High Quality
  Format: PNG
  Resolution: 800x800
  Size: 319.8KB
  Downloads: 183
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  Ice Cube Picture Free Download Image
  Format: PNG
  Resolution: 600x600
  Size: 122.6KB
  Downloads: 181
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  Green Energy Picture Free Transparent Image HQ
  Format: PNG
  Resolution: 400x400
  Size: 11.4KB
  Downloads: 179
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  Green Energy Free HD Image
  Format: PNG
  Resolution: 512x512
  Size: 22.9KB
  Downloads: 176
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  Ice Cube Free HQ Image
  Format: PNG
  Resolution: 1000x800
  Size: 268.1KB
  Downloads: 176
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  Ice Cube Download Free Download PNG HQ
  Format: PNG
  Resolution: 600x600
  Size: 134.0KB
  Downloads: 169
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  Green Leafs Free HD Image
  Format: PNG
  Resolution: 1885x2257
  Size: 82.5KB
  Downloads: 100
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  Vine Leaf Grape Free Transparent Image HD
  Format: PNG
  Resolution: 590x346
  Size: 90.7KB
  Downloads: 98
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  Green Organic Leafs Photos Free Download PNG HQ
  Format: PNG
  Resolution: 2201x2812
  Size: 5.3MB
  Downloads: 98
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  Fresh Green Leafs Photos PNG Free Photo
  Format: PNG
  Resolution: 2177x1988
  Size: 99.6KB
  Downloads: 97
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  Vine Leaf Grape Free Clipart HD
  Format: PNG
  Resolution: 1321x1787
  Size: 575.0KB
  Downloads: 97
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  Grape Vine Leaf Art Free Download Image
  Format: PNG
  Resolution: 665x750
  Size: 89.6KB
  Downloads: 96
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  Vine Leaf Grape Bunch PNG Free Photo
  Format: PNG
  Resolution: 960x449
  Size: 314.1KB
  Downloads: 94

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