Question for a Treeologist

[randywa]

I'm starting to cut up some cottonwood limbs, and have found a few of these. This limb is partly hollow and these are inside and still attached. Are they like burls? They don't have much grain pattern, but the outside wood where they are is really wild.

 

[phillywood]

google cottonwood and you will find plenty of info. on it.
http://www.google.com/search?source..._gc.r_pw.&fp=68b3f9ae28a95316&biw=881&bih=462