Mystery of the Knobd Knee

Cypress tress have knobby knees
Their knees are knobd
Their knobs are kneed

What are the knobs with all those knees?
To explain this great tree mystery?

One theory is the knees take in
the element turns steel and tin

Or by river, pond, or by lake
Each knobbyd knee acts as a stake

The simple answer comes when we ask
The knees themselves about this task

"Why up and out do come knobd knees?"
"Mutiny Mutiny on the trees!"