Color combinations - what drives them in nature?

Submitted by Jeff Buster on Thu, 04/07/2011 - 20:53.

crocus in sunlight yellow

Purple, gold, brilliant white - crocus in bloom - what's the point?  Too cold for bees. 

The show is only a few days in length - while the other 362 days spin by. 

How does this work?

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Botany ??

Good question Jeff--I would like to know the evolutionary strategy at work here :)