Mentioned in Song of Solomon 2:3 8:5 Joel 1:12. Many suppose the citron- tree to be here meant. The rich color, fragrant odor and handsome appearance of this tree, both in flower and in fruit, agree well with the above passages. Thoughts of wise men, well expressed, are like "apples of gold in pictures of silver," That is, like ripe and golden fruit in finely wrought silver baskets, Proverbs 25:11.
These dictionary topics are from American Tract Society Bible Dictionary published in 1859. Public Domain, copy freely.
Rand, W. W. "Entry for 'APPLE-TREES'". "American Tract Society Bible Dictionary".