Thinking mine might be closer to the species makes me feel like less of failure. My came that very first year it was offered, Faraway Flowers through Hyde UK. I have killed a l. napalense. So the thought of me killing its offspring is no surprise
Some things you just chalk up to not meant to be. I have always thought that species was really special, the color, the form, even the leaves... Thinking it was bred with something else, that still had the look of it, but maybe added hardiness and potential for garden worthiness, had to try it.
Maybe they are different clones from the same cross. Or maybe they are the same. I'm never confident with this sort of thing, as Lefty mentioned there are so many variables. But Lorn's theory makes me feel better about myself, so I'll stick with that.