If only it weren't an irrepressible weed, what a terrific alpine plant this would be: gorgeous contrast of flower and foliage. Wonderful deep purple foliage...aaah! the irony of it all. Oxalis corniculata thriving in a crack at a church where I spoke recently. I remember plucking leaves of this on the way to grade school and savoring the sour tang of oxalic acid (which I believe is toxic in larger quantities). Few weeds are more annoying to try and eliminate in greenhouse collections, and I have a patch that still resurrects itself in parts of my rock garden no matter how vigilant I try to be to get rid of it all. Yes. Beauty is relative indeed!