I thought you might be interested in an article I have written about White Jacaranda trees. It's based in Australia, but the original White Christmas Jacaranda in Australia was sourced from a grower in Florida- see the link for details. I am sure Americans love the purple Jacaranda as much as Australians do, despite it not being a native of either country, so the beauty of a rare white species won't be lost on you at all.
http://cayliejeffery.blogspot.com.au/2013/03/white-christmas-in-australia.html