Papaver rhoeas
"Spring River Flows East" derives its title from the poem “”, written by Li Yu, the last ruler of the Southern Tang Dynasty. ("Beauty Yu" is the metaphoric name for Papaver rhoeas) The poem was written shortly after the loss of his kingdom to the Song Dynasty. “The Beautiful Lady Yu” is also a “词牌” or Cí (a type of lyric poetry). Historically, “The Beautiful Lady Yu” was used to commemorate the death of military warlord Xiang Yu’s wife (虞姬). The last sentence of this poem is the most famous and is also the name of this movie. It is a famous line among ancient Chinese poems that uses water as a metaphor for sorrow and is used to express that the amount of sorrowful thought is as endless as the river water in spring.