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 Images Free Clipart HD
  Format: PNG
  Resolution: 749x807
  Size: 383.7KB
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  Green Leaf Free PNG HQ
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  Growing Plant Free Download Image
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  Size: 16.1KB
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  Half Moon Free Transparent Image HQ
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  Ice Cube Free HQ Image
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  Half Moon PNG File HD
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  Colored Dandelion Free HD Image
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  Ice Cube Download Free Download PNG HQ
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  Ice Cube Image Free Download PNG HQ
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  Downloads: 213
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  Soap Bubbles Download Image HD Image Free PNG
  Format: PNG
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  Downloads: 237
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  Soap Bubbles Download Free Download PNG HD
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  Soap Bubbles Photos PNG Free Photo
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  Size: 54.2KB
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  Soap Bubbles Download Free Image
  Format: PNG
  Resolution: 435x800
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  Format: PNG
  Resolution: 600x600
  Size: 292.5KB
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  Soap Bubbles PNG Image High Quality
  Format: PNG
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  Downloads: 202
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  Gardening Download Image Download HQ PNG
  Format: PNG
  Resolution: 512x512
  Size: 21.3KB
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