Tree Shaped Tombstones - Doctors and Wives

In small town America, especially in times past, the local doctor was held in respect bordering on reverence.  Less so nowadays.  In a peaceful cemetery outside of tiny Lowell Wisconsin I found two "Tree Shaped Tombstones" of local docs.  And as always, things to ponder.

Here's a fairly typical example.  Nicely carved and holding up well.  Dr. Benson died in 1889.  His wife Mary in 1896.

A couple of rows over we find this one.  It's not as nice a monument either in initial design or in its current condition.

Of course I started having questions right away.  Why did Delia D. Weed have a different last name than her husband, Doctor Miller?  Early Sufferagette?  I can't see it being a remarried name, she died before her husband.  Oh, and the line "Born in N.Y. City" seems a bit...pretentious.  Did she flaunt her urbane origins?

Dr. Miller's info is in much deteriorated condition.  Peculiar, as he died nine years after his wife.  

Trying to figure out the mechanics and business of these distinctive tombstones has proven to be a daunting challenge.  But in this same cemetery I found another clue....