We used to have some of this at the garden a few years ago, then it somehow didn't survive... And last summer, a friend brought a piece of it digged out of his garden, I did put it in a pot at the terrace which it seems to have enjoyed a lot. Then, I took it indoors through the winter, and these days it started to bloom again. I'll wait for about one more month to bring it back to the terrace.
All these said, I'd be happy if anyone knows its name...
Edited to add :
Here it is : http://en.wikipedia.org/wiki/Aptenia