Problematic Sunflower
Is our sunflower falling short of its Fibonacci destiny?
Check the blog for pics and more details - http://periodicvideos.blogspot.co.uk/2012/07/sunflower-missing-spiral.html
The flower on Flickr: http://www.flickr.com/photos/numberphile/7650953626/in/photostream
Turing's Sunflowers: http://www.turingsunflowers.com/