> But DNA is what makes an organism what it is. The morphological characters that underlie "old" taxonomy are only common to the groups of plants dubbed "species" thereby because of the common DNA these organisms share. (If heritance is not the reason a given group of organisms share a common trait, I think everyone would agree they shouldn't be called a biological species at all).> > > its DNA, and the old definitions of "species" -- all of them, and several Epigenetics anyone? 20-odd years ago, it was believed introns had no function ... hello siRNA! It will be a long time before such things are well understood in plants, but for some reason people with vested interests are happy to overlook them, for the time being. T