Another problem with 'Present' is that by this logic, all the others are 'Absent' and you effectively have a white list (GOOD) and a black list (EVIL). Try taking any plant from the 'dark side' into the light. I think the Australia example is a good example of a bad system. And it also suggest that every species and subspecies will be designated good or bad regardless of genetic affinity or the rest of the genus/family. Oh dear. Jim W. -- Dr. James W. Waddick 8871 NW Brostrom Rd. Kansas City Missouri 64152-2711 USA Ph. 816-746-1949 Zone 5 Record low -23F Summer 100F +