Pink Parasols

The intensity of the colour of this flower always staggers me. It sits there for most of the year, looking as if butter wouldn't melt in its mouth, then it gives a small hint that something interesting might happen and then - BANG! It just goes crazy, chucking up umbrellas of the most ridiculously vivid pink, everywhere.
Like most of our plants around here, it is from a cutting and a very welcome one at that.
Just wish I knew its name.