I can only second what Peter and others have said more eloquently than I can, while I can sympathize with Dot and Ray. The problem may be the idea that we _should_ be able to have a simple and definitive way to describe nature. Perhaps what gets in the way is the simple Western notion that if something is not A then it must be B--that everything should or even can be placed into neat little boxes. The boxes may be useful in their way, but Mother Nature in her profusion and in the process of constant change simply cannot be described accurately and permanently in this way not matter how many maps we make or how sophisticated they are. And just to throw a little more fuel on the fire: http://www.telegraph.co.uk/expat/6538333/Scientists-unveil-plant-DNA-barcode.html "Vapid" and "absurd" were comments that I read going around the botanic garden where I work! Harvey Usually sunny Southern California that's experiencing a few sprinkles.