This is a Dandelion. But careful, it is not as simple as it seems...
There are 2 "dandelions", the Common Dandelion Taraxactum officinale and the from the dandelion tribe with the genus Leontodon. I think yours is the common Taraxactum sp. and possibly Taraxactum officinale. But I recommend to check some more literature to be sure. I am not so into flora anyway ;-)...
http://en.wikipedia.org/wiki/Taraxacum_officinale
http://en.wikipedia.org/wiki/Leontodon
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