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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  Leaf Hd
  Format: PNG
  Resolution: 1600x2400
  Size: 3.5MB
  Downloads: 1,023
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  Leaf Transparent Background
  Format: PNG
  Resolution: 1885x2257
  Size: 181.6KB
  Downloads: 908
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  Leaf Photo
  Format: PNG
  Resolution: 1600x1703
  Size: 1.9MB
  Downloads: 673
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  Leaf
  Format: PNG
  Resolution: 1725x1142
  Size: 2.0MB
  Downloads: 664
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  Leaf Photos
  Format: PNG
  Resolution: 1600x1200
  Size: 593.1KB
  Downloads: 661
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  Leaf Clipart
  Format: PNG
  Resolution: 960x640
  Size: 466.2KB
  Downloads: 658
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  Leaf Transparent Image
  Format: PNG
  Resolution: 1000x983
  Size: 1.4MB
  Downloads: 656
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  Leaf Transparent Picture
  Format: PNG
  Resolution: 900x892
  Size: 852.7KB
  Downloads: 641
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  Leaf File
  Format: PNG
  Resolution: 2686x2818
  Size: 1.3MB
  Downloads: 615
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  Leaf Free Download
  Format: PNG
  Resolution: 1376x1600
  Size: 2.3MB
  Downloads: 613
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  Leaf Picture
  Format: PNG
  Resolution: 900x870
  Size: 687.2KB
  Downloads: 608
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  Green Leaf PNG Free Photo
  Format: PNG
  Resolution: 975x1084
  Size: 322.1KB
  Downloads: 587
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  Leaf Image
  Format: PNG
  Resolution: 1589x870
  Size: 712.6KB
  Downloads: 586
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  Ice Cube Photos Free Download PNG HD
  Format: PNG
  Resolution: 612x612
  Size: 289.2KB
  Downloads: 579
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  Leaf Transparent
  Format: PNG
  Resolution: 1300x1131
  Size: 1.7MB
  Downloads: 556
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  Green Leaf Free PNG HQ
  Format: PNG
  Resolution: 800x600
  Size: 605.4KB
  Downloads: 531
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  Green Leaf Free Transparent Image HD
  Format: PNG
  Resolution: 3500x2300
  Size: 3.5MB
  Downloads: 518
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  Soap Bubbles Free Transparent Image HD
  Format: PNG
  Resolution: 484x350
  Size: 134.5KB
  Downloads: 492
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  Japanese Flowering Cherry Download Free Image
  Format: PNG
  Resolution: 675x514
  Size: 367.9KB
  Downloads: 484
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  Green Leaf Image Free Photo PNG
  Format: PNG
  Resolution: 636x720
  Size: 461.2KB
  Downloads: 405

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