I think it may be a Phormium.
http://garden.org/plants/searc...
Cordyline will have growth emanating from a central stem, while Phormium will have a more fan-like arrangement. You may need to poke around at the base of the plant to tell for sure since young Cordyline plants can have a more "grassy" look the first year before they develop a trunk. To me, the growth pattern on your plant looks like Phormium and not Cordyline. I have limited experience with both so you may want to ask some of the Pacific Coast gardeners since they should be more familiar with growing them.
I do, definitely, know it's gorgeous!
Donald, your Cordyline is lovely, too!
