Hello!

Is this bamboo and if it is what species is it? I found it growing out of nowhere in my backyard.

http://img.photobucket.com/albums/v2...7/94eef98c.jpg
http://img.photobucket.com/albums/v2...7/f39fcbee.jpg
http://img.photobucket.com/albums/v2...7/1384094a.jpg
http://img.photobucket.com/albums/v2...7/7f99282d.jpg