I found an unusual tree several years ago and it was a Buckthorn with very nice nebari. I bought it and brought it home and have chopped it back once and wired it. The wire was removed several years ago to let some scars heal up. The tree was recently reworked and I have made a page for Rhamnus frangula ‘Asplenifolia’ under Deciduous Trees. You will plenty of information about the species and I will be updating the progress on the tree as needed.