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Ipomoea pes-caprae
Gorgeous purple flower. Star shaped centre, attached to a crawler plant, covering a big stretch of beach.
On the beach near Cairns, Queensland, Australia
I agree with Ipomoea pes-caprae as the leaf visible here:
http://lh5.ggpht.com/Nrh7gsJLKh1hmgSrzLm...
is consistent with I.pes-caprae but not Calystegia soldanella.