I am English, but I have to admit that some of the world's most beautiful trees are native to North America
Here are ten of my favorites - each just three prims, realistic and great value for money!
Like all my trees, they are copyable (yay!) and modifiable.
http://www.xstreetsl.com/modules.php?name=Marketplace&file=item&ItemID=965266
By the way - these trees are now found in gardens and parks all over the world - and this is Second Life - you can grow any trees here