“What kind of tree has no money?”/“Burr oak.”

Money doesn’t grow on trees, and there’s a pun:
 
Q: What kind of tree has no money?
A: Burr oak (broke).
   
“If it ain’t burr oak, don’t affix it” was posted on the newsgroup alt.humor.puns on September 6, 2002. “What Kind of tree has no money? A burr oak” was posted on Twitter on May 18, 2010.
   
   
Wikipedia: Quercus macrocarpa
Quercus macrocarpa, the bur oak, sometimes spelled burr oak, is a species of oak in the white oak section Quercus sect. Quercus, native to North America in the eastern and central United States and eastern and central Canada. This plant is also called mossycup oak and mossycup white oak.
 
Quercus macrocarpa is widespread in the Atlantic coastal plain from New Brunswick to North Carolina, west as far as Alberta, eastern Montana, Wyoming, and northeastern New Mexico. The vast majority of the populations are found in the eastern Great Plains, the Mississippi/Missouri/Ohio Valley, and the Great Lakes region.
     
Google Groups: alt.humor.puns
Puns of the Weak 09/06/02
Stan Kegel
9/7/02
(...)
A New Hampshire carpenter was called upon to put up a bulletin board in the church vestry. Since the walls were marble, he tried to glue it rather than nail it but ran into problems until he tried making the frame out of burr oak. That adhered quite successfully, leading him to admonish his young assistant, .“If it ain’t burr oak, don’t affix it.”
(John Fenn)
 
Twitter
Alex Gorsky‏
@AlexGorsky
What Kind of tree has no money?
A burr oak.
11:20 PM - 18 May 2010
 
Twitter
j a y‏
@_jayrl
“you go to broke (bur oak)? like broke as in no money?” LMFAO IM CRYINNNGG
7:20 PM - 27 Oct 2013
   
Reddit—Dad Jokes
What do you call a tree with no money? (self.dadjokes)
submitted August 8, 2017 by theroywonder
Bur-oak.
 
The Amazingly Lame Joke of the Day
Sunday, August 13, 2017
What do you call a tree with no money?
Burr oak.
Posted by Tim Wycislak at 11:43 AM