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The Citron daylily (Hemerocallis citrina) belongs to Liliaceae (the Lily family). It is a perennial herb that is distributed in central and eastern China and the Amur region of Russia. It grows on forest edges, grasslands, and slopes at altitudes of up to 2000 m and grows to about 1 m tall. The leaves are bright green and linear. From May to August, it puts out scapes and produces lemon-colored flowers. The fruit is an elliptic capsule. The tuber, inflorescence, buds, and flowers can all be cooked and eaten. It is widely cultivated as an edible flower, especially in Hunan Province in China and Hualien County in Taiwan. It is also known as "Ukon-kisuge" in Japanese. In Chinese, it is "黄花菜" (huang hua cai).
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