Identification please - if possible

We went out to supper last night and parked in a town square.  There
was a tree, about the size of a mature Acacia with the most beautiful
pale lavender coloured flowers, the smell was exotic.  I could see
some seeds on the tree which looked like nuts, I couldn't reach the
lower branches to pick one to try and grow it on so I threw some
pebbles but missed every time.  I brought a flower home that has
fallen on the ground and Edward took a pic, can anyone identify it.
It is on on my hand so that you can get an idea of scale.  I will post
this in another group also.
http://i29.tinypic.com/35hpgcn.jpg

Judith