I am not current on how modern botanists divide up the flora of the world. I do recall that 60 years ago, zoologists divided the Americas into Nearctic (North America north of Mexico), Neotropical, and some other zones. I agree with comments earlier that we need to rid the New World of Homo sapiens if we want to restore this part of the world to it's natural condition. Seeing where I live, one can probably understand that this option does not appeal to me. Another problem with many enthusiastic conservationists is that they do not recognize the the only constant in Nature is change. Species come and go. Climates come and go. Continents come and go. Change persists. I am in favor of thwarting Nature's efforts to eliminate the unfit -- rare species are rare for a reason, not always because of human encroachment. Let us try to preserve the rare, whether they are fit or not. Jim Shields in sunny but chilly Westfield, Indiana USA, where Homo sapiens is an invasive alien species At 09:41 PM 3/18/2010 -0400, you wrote: >Well Leo and Alberto, I think the answer to this one depends on how you >divide up the Americas! > >....... >Jim McKenney > >jimmckenney@jimmckenney.com > >Montgomery County, Maryland, USA, 39.03871º North, 77.09829º West, USDA zone >7 ************************************************* Jim Shields USDA Zone 5 Shields Gardens, Ltd. P.O. Box 92 WWW: http://www.shieldsgardens.com/ Westfield, Indiana 46074, USA Tel. ++1-317-867-3344 or toll-free 1-866-449-3344 in USA