Tree of Death (?), n.
1. In botany, the manchineel tree, native to tropical southern North America and northern South America.
2. In Kabbalah, a visual representation of the averse Tree of Life, composed of the Qliphoth and the 22 tunnels of Set connecting them.
3. In biology, a tree of life that includes existing as well as extinct species to explore overall patterns of phylogenetic relationship to better understand the evolution of the extant taxa.
4. In literature, The Tree of Death is the title of a short story by Barry Pain from Short Stories of To-day and Yesterday, published in 1928.
5. In literature, The Tree of Death is the title of a novel by Marcia Muller, published in 1996.
Note: Not to be confused with Tree of Perdition, which is a mythic rare four mana black plant creature with defender printed in the Eldritch Moon expansion set for Magic: The Gathering.