Doug said:

Several of these are popping up randomly in my yard. They are
deciduous and grow very fast, like a few feet per year. What is it?

http://i56.photobucket.com/albums/g1...d/Img_1063.jpg

Tree-of-heaven (Ailanthus altissima) a nasty, stinky, weedy tree.
Best removed when first sprouted as they develop hellishly persistant
root systems which relentlessly resprout.
--
Pat in Plymouth MI ('someplace.net' is comcast)

Any technology distinguishable from magic is insufficiently advanced.
(attributed to Don Marti)