Hán Yànzhí suǒ xiě de 《 Júlù 》 shì shìjiè shàng zuì zǎo de gānjú zhuānzhù.
Han Yanzhi's Treatise on Oranges is the earliest known monograph on citrus in the world.
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history
Son of the famed Song general 韩世忠. While serving as prefect of Wenzhou, Han Yanzhi compiled 《橘录》 (Treatise on Oranges) in 1178 - the world's first systematic monograph on citrus, classifying 27 varieties.