"A Greco-Roman flower of the underworld, and of Persephone -- a lily of appropriately pallid coloration with which to console the spirits of those chosen by the gods to enter the Elysian Fields. The asphodel is therefore a funerary symbol of mourning. Its roots, food for the dead, were thought to cure snakebite."
from Dictionary of Symbols: an illustrated guide to traditional images, icons and emblems by J. Tresidder (1997)
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