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According to the Quran, Zaqqum (Arabic: زقوم) is a tree that "springs out of the bottom of hell-fire" or Jahannam. It is mentioned in verses 17:60 (as the "cursed tree"), 37:62-68, 44:43, and 56:52, of the Quran.
Botany
The name zaqqum has been applied to the species Euphorbia abyssinica by the Beja people in eastern Sudan. In Jordan, it is applied to the species Balanites aegyptiaca. In Turkey, zaqqum (zakkum) is Nerium oleander.
References
Zaqqum Wikipedia(Text) CC BY-SA