Mark, The link isn't working... I think i have had brevistyla, or i acquired but it is very similar to A. alpina, and they do readily cross. Most of my aquilegias come from seed ex, they are really not true to name, and sometimes they do not even look like a botanical variety. The problem is that they are cross pollinated with garden hybrids, mostly with McKanna hybs. The truth is that in my country they only last for about 3-4 years, then the plant dies in winter. I've tried vegetative propagation but not worth it. Seed is in abundance but they are not true! I've seen plants raised from Black Barlow, not even look like what it should. They were black but most of them looked horrible. What we can buy as Nora Barlow also not the original strain. In the orogonal strain there was pink white with green tips, if you look todays strains there is no green tip at all! Altough they are really nice plants, but really not long lived and they will hybridise in your garden. Janos Z5 Hungary