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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  Falling Leaf Download Free Image
  Format: PNG
  Resolution: 590x300
  Size: 283.9KB
  Downloads: 207
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  Falling Leaf Free Photo PNG
  Format: PNG
  Resolution: 1920x1080
  Size: 686.5KB
  Downloads: 224
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  Colored Dandelion Free HD Image
  Format: PNG
  Resolution: 794x1005
  Size: 326.3KB
  Downloads: 207
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  Falling Petals Free Download PNG HD
  Format: PNG
  Resolution: 730x1095
  Size: 190.1KB
  Downloads: 210
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  Falling Petals Free HQ Image
  Format: PNG
  Resolution: 894x894
  Size: 842.2KB
  Downloads: 212
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  Soap Bubbles Download Image HD Image Free PNG
  Format: PNG
  Resolution: 534x712
  Size: 213.0KB
  Downloads: 237
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  Colored Dandelion Image HQ Image Free PNG
  Format: PNG
  Resolution: 600x600
  Size: 112.7KB
  Downloads: 184
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  Dandelion Free Photo PNG
  Format: PNG
  Resolution: 1200x900
  Size: 495.3KB
  Downloads: 199
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  Soap Bubbles Download Free Download PNG HD
  Format: PNG
  Resolution: 1257x641
  Size: 282.8KB
  Downloads: 243
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  Dandelion Download Download Free Image
  Format: PNG
  Resolution: 960x720
  Size: 634.7KB
  Downloads: 195
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  Soap Bubbles Photos PNG Free Photo
  Format: PNG
  Resolution: 500x468
  Size: 54.2KB
  Downloads: 319
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  Dandelion Picture Free HD Image
  Format: PNG
  Resolution: 1280x1047
  Size: 225.4KB
  Downloads: 211
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  Soap Bubbles Picture Free HQ Image
  Format: PNG
  Resolution: 640x627
  Size: 174.3KB
  Downloads: 209
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  Soap Bubbles Download Free Image
  Format: PNG
  Resolution: 435x800
  Size: 172.6KB
  Downloads: 201
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  Soap Bubbles Images Free Transparent Image HD
  Format: PNG
  Resolution: 600x600
  Size: 292.5KB
  Downloads: 207
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  Soap Bubbles PNG Image High Quality
  Format: PNG
  Resolution: 919x720
  Size: 506.0KB
  Downloads: 202
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  Gardening Download Image Download HQ PNG
  Format: PNG
  Resolution: 512x512
  Size: 21.3KB
  Downloads: 204
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  Gardening Download Free Transparent Image HQ
  Format: PNG
  Resolution: 1694x1424
  Size: 443.0KB
  Downloads: 219
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  Gardening HD Free Transparent Image HD
  Format: PNG
  Resolution: 2000x2000
  Size: 169.1KB
  Downloads: 220
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  Dandelion Free HQ Image
  Format: PNG
  Resolution: 800x600
  Size: 388.7KB
  Downloads: 217

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