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In page Leuce (mythology):

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The white poplar was also sacred to Persephone, for whom Leuce seems to be a doublet or epithet, as a goddess of regeneration.[citation needed] Robert Graves used the myth of Leuce in developing his poetic theories of mythology. Graves, for instance, holds that the back of the poplar leaf was turned white by the sweat of Herakles.[13] In The White Goddess, he names the white poplar as one of the "three trees of resurrection", along with alder and cypress.[14]