Both the tree and the flower are referred to as the udumbara (Sanskrit, Pali; Devanagari: उडुम्बर) in Buddhism.
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The Japanese word udonge (優曇華) was used by Dōgen Zenji to refer to the flower of the udumbara tree in chapter 68 of the Shōbōgenzō ("Treasury of the Eye of the True Dharma").