Where are the "Moon Trees"?

Back in 1971, Apollo 14 carried 400 tree seeds which were tended by astronaut Stuart Roosa in lunar orbit. After their safe return to Earth, the seeds germinated and were planted around the country. Apparently, the trees fared well and can still be seen today. Where are the moon trees? What kind of trees are they?

This site has a the location of quite a few, as well as quite a bit of background information.

http://nssdc.gsfc.nasa.gov/planetary/lunar/moon_tree.html