What is an Apple of Sodom?

"The Apple of Sodom is a strange tree that many voyagers claim to have seen at Sodom and Gomorrah, the Biblical cities which the Lord chose to destroy by a rain of fire and brimstone from heaven, it was believed that God created a tree with deceitful fruit known as the 'Apple of Sodom' to lure the weary traveler passing through the area. If a man were so given to his senses that he would try to pluck one of these apples, it would turn to smoke and ashes in his hand, a sure sign of God's eternal displeasure with those who would sucumb to their physical senses at this site of retribution." (From: Bizarre plants, "Plants that never were," Wm. Emboden.)