I agree with those who think 'jubal' is a mistake for something else. People have a for substituting a word with similar stress and vowels for a word they can't really recall.

From the Twa Sisters
   Here's two little sisters walking along...
   Here's two royal sisters walking along....

Wildwood Flower
   I'll twine with my mingles of raven-black hair...
   I'll twine mid the ringlets of my raven-black hair...