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(source: http://www.flickr.com/photos/2thickskinned/2387837753/sizes/o/ )
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(source: http://www.flickr.com/photos/janinerussell/2599401819/sizes/o/ )
What's apparently happening is that the sappy bits under the bark are bright green, but it loses it's bark irregularly, and the exposed green bits change color over time, so that bits are green, other orange, or purple, etc.
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