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The Longan (Simplified Chinese: 龙眼; Traditional Chinese: 龍眼; pinyin: lóngyǎn; Cantonese long-ngan; Vietnamese long nhãn - literally "dragon eye") is an evergreen tree native to Southeast Asia from southern China south to Indonesia. It is also called guiyuan (桂圆) in Chinese and lengkeng in Indonesia.
The fruit is edible, and is often used in East Asian soups, snacks, desserts, and sweet-and-sour foods. They are round with a thin, brown-coloured inedible shell. The flesh of the fruit, which surrounds a big, black seed, is white, soft, and juicy.
Longans and lychees bear fruit at around the same time of the year. Dried longan (Chinese: 圓肉; pinyin: yuánròu; literally "round meat") are often used in Chinese food therapy and herbal medicine. In contrast with the fresh fruit, the flesh of dried longans is dark brown to almost black.
龍眼,又稱桂圓、亞荔枝、燕卵,為中國南方水果,多產於兩廣地區。與荔枝、香蕉、菠蘿同為華南四大珍果。
其樹為大喬木,高5-10米。葉互生,為偶數羽狀複葉,長橢圓形,長6-10厘米,寬2-4厘米,基部傾斜。開白花,成實於初秋。其實纍纍而墜,外形圓滾,如彈丸卻略小於荔枝,皮青褐色,革質而脆,果肉味甜可吃。去皮則剔透晶瑩偏漿白,隱約可見內里紅黑色果核,極似眼珠,故以「龍眼」名之。