I think English /wherever grown timber depends on local soil,so many variables. If they are simply classified by local names well anything is possible. Here in Australia one of my favourites Brown Mallee can have umpteen variations in differring parts of the country. Black lines, burl formations,spacing of growth rings denoting weather conditions etc,just in the few hundred I have left I revel in the differences.I gave a huge number of blanks over 60 kilos of cut blanks to a mate in Melbourne and I drove down to his in December with boxes and boxes of more blanks.I love Timber. Olive Wood is a classic for variations in different countries,in Australia it was commenced by early Immigrants bringing plants from Italy etc,some now are huge. In Tasmania a prized timber is what they call native Olive Wood.
Peter.
Peter.