I had it grown emersed and looked similar to blue hygro type leaf but had slight broney red colouring. angustafolia Ive had emersed and is almost hairy like leaves then when submersed the leaves grow a lot longer. temple or corymbosa as you say is definatly a wider leaf and gets red tinges in it from experience. mine looks smilar to this http://www.aqua-fish.net/imgs/plants/024.jpg
thanks for your info