Have you seen any crosses of the acer ginnala 'flame' and the acer tataricum 'hot wings'? I am growing both of these near each other and a small volunteer maple started rapidly growing not far from them. It looks more like a ginnala 'flame' in color and in most of the leaves, but some of the leaves have the 'hot wings' look. So far it has not produced any seed pods, since it has only been around for a couple of seasons, but I'm curious if it is possible for the two maples to cross (neither are sterile, are they?) or if most likely the ginnala is the parent.