JB, Aspen has been altered somehow to give it fringey petals, and that's why I think it's so hard to find. It's phylloclades are really thick and have kind of a twist in them. You can tell that it's a little different than a normal Christmas cactus.
By the way, I love your birds! I had a cockatiel named Joe for 15 years, and he was the love of my life (even though the little bugger prefered my husband over me.) I don't have time for a bird now, and I don't miss the noise, but Joe was a great experience.
