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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  Half Moon Image Download HD PNG
  Format: PNG
  Resolution: 1500x1500
  Size: 836.2KB
  Downloads: 369
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  Green Leaf Picture Free PNG HQ
  Format: PNG
  Resolution: 800x600
  Size: 18.5KB
  Downloads: 360
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  Soap Bubbles Image Free HD Image
  Format: PNG
  Resolution: 4248x3840
  Size: 3.3MB
  Downloads: 339
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  Falling Petals Image Free HQ Image
  Format: PNG
  Resolution: 650x492
  Size: 125.7KB
  Downloads: 338
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  Japanese Flowering Cherry Download Free Image
  Format: PNG
  Resolution: 2714x2714
  Size: 2.4MB
  Downloads: 337
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  Jasmine Garland Image Free Clipart HQ
  Format: PNG
  Resolution: 500x500
  Size: 192.0KB
  Downloads: 324
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  Soap Bubbles Photos PNG Free Photo
  Format: PNG
  Resolution: 500x468
  Size: 54.2KB
  Downloads: 319
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  Soap Bubbles Free Download Image
  Format: PNG
  Resolution: 1921x1893
  Size: 1.1MB
  Downloads: 318
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  Japanese Flowering Cherry HD Image Free PNG
  Format: PNG
  Resolution: 900x692
  Size: 887.9KB
  Downloads: 316
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  Green Leaf Free Clipart HQ
  Format: PNG
  Resolution: 800x1200
  Size: 1.1MB
  Downloads: 311
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  Japanese Flowering Cherry Picture PNG Download Free
  Format: PNG
  Resolution: 950x897
  Size: 233.4KB
  Downloads: 310
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  Japanese Flowering Cherry Image HD Image Free PNG
  Format: PNG
  Resolution: 650x651
  Size: 337.7KB
  Downloads: 309
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  Gardening Free Download PNG HD
  Format: PNG
  Resolution: 1024x773
  Size: 1.2MB
  Downloads: 309
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  Ice Cube PNG Free Photo
  Format: PNG
  Resolution: 550x367
  Size: 192.3KB
  Downloads: 305
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  Small Leaves Green Cartoon Download Free Image
  Format: PNG
  Resolution: 658x406
  Size: 42.9KB
  Downloads: 304
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  Half Moon Free Download Image
  Format: PNG
  Resolution: 1300x1300
  Size: 486.4KB
  Downloads: 302
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  Japanese Flowering Cherry Free PNG HQ
  Format: PNG
  Resolution: 480x200
  Size: 100.9KB
  Downloads: 299
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  Green Leaf Photos HD Image Free PNG
  Format: PNG
  Resolution: 852x480
  Size: 240.3KB
  Downloads: 298
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  Green Leaf Free Transparent Image HQ
  Format: PNG
  Resolution: 600x600
  Size: 21.4KB
  Downloads: 298
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  Dandelion Free Download PNG HQ
  Format: PNG
  Resolution: 600x600
  Size: 71.8KB
  Downloads: 292

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