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rabbitear iris (Iris laevigata)
A water-loving iris that grows in shallow ponds and wet ditches, producing deep purple flowers in May and June. Long celebrated in Japanese poetry and art.
Often written 燕子花 as well — both spellings are jukujikun. Famous in classical poetry from the Heian-period 伊勢物語 (Tales of Ise) and in the Edo-period folding-screen paintings by Ogata Kōrin.