The word-translated mulberry-tree signifies literally weeping, and indicates some tree, which distils balsam or gum. The particular species is not known; though some think the popular, or aspen, may be intended, 2 Samuel 5:23-24; 1 Chronicles 14:14-15.
These dictionary topics are from American Tract Society Bible Dictionary published in 1859. Public Domain, copy freely.
Rand, W. W. "Entry for 'MULBERRY-TREE'". "American Tract Society Bible Dictionary".