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Valeriana officinalis
Valerian is a hardy perennial flowering plant, with heads of sweetly scented pink or white flowers which bloom in the summer months.
Valerian root has been demonstrated to possess sedative and anxiolytic effects.
Salvi, thanks for the ID.
Finally, it is valerian flower. I know it is very difficult to identify without the leaves or stem. Thanks for all your comments, Hayde, Karen and Monkey.m&Nana.p
The flowers look like lilac (syringa) - http://en.wikipedia.org/wiki/Lilac
As hayde says, leaves would be useful for ID.
It looks a bit like thyme... Although its hard to tell without the leaves or stem. Did it smell like thyme?