A little behind went Connoway, in the same manner holding a "bourtree" pop-gun which he had just been fashioning for some lucky callant of his acquaintance.    From Wordnik.com.  [The Dew of Their Youth] Reference

In some parts of Scotland, people would not put a piece of elder wood into the fire, and I have seen, not many years ago, pieces of this wood lying about unused, when the neighbourhood was in great straits for firewood; but none would use it, and when asked why? the answer was -- "We don't know, but folks say it is not lucky to burn the bourtree.".    From Wordnik.com.  [Folk Lore Superstitious Beliefs in the West of Scotland within This Century] Reference

’ pursued his guide, ‘on this very spot the man fell from his horse—I was behind that bourtree-bush at the very moment.    From Wordnik.com.  [Chapter LIII] Reference

The wind blew higher, and like a hurricane; the rain began to fall in perfect spouts; the auld kirk rumbled and rowed, and made a sad soughing; and the branches of the bourtree behind the house, where auld Cockburn that cut his throat was buried creaked and crazed in a frightful manner; but as to the roaring of the troubled waters, and the bumming in the lum - head, they were past all power of description.    From Wordnik.com.  [The Life of Mansie Wauch Tailor in Dalkeith, written by himself] Reference

Her bourtree dykes an mossy wa's.    From Wordnik.com.  [The Modern Scottish Minstrel, Volume II. The Songs of Scotland of the past half century] Reference

For bourtree bank, or warlock craigie?.    From Wordnik.com.  [The Modern Scottish Minstrel, Volume II. The Songs of Scotland of the past half century] Reference

&c. Fearful soughs the bourtree bank.    From Wordnik.com.  [The Modern Scottish Minstrel, Volume II. The Songs of Scotland of the past half century] Reference