I think it may be one of the Parade series, as there were a lot of those in the display with it, but this one wasn't labeled, so I don't know which one. it's maybe semidouble, probably around 30-45, soft, open and with that not-quite-a-ruffle shell-shaped curve to the petals, not pointy/reflexed or floppy.

and as far as mini, the blossoms and leaves are, but at its 3rd spring it is almost 3 feet high and rising, and blooms so madly i can't bear to prune it. It has a decidedly vertical habit, a little vase-shaped maybe. when i upload a pic I will try to link to it, but does this sound familiar? any rule-outs or ideas?