Hi Rhys, Flora I can usually be picked up very cheaply on line. It is complex - and dated in some parts, but it has a lot of good information in it. Salmon's books on exotic trees are the best that are available, but I wouldn't worry about his other books as they are now quite dated and Dawson and Lucas is very good. His native trees of NZ is good, but quite similar to Dawson and Lucas, but is a lovely book if you can pick it up cheaply (but then I just love the cover image!)