龙眼为无患子科龙眼属植物,该属约20种,我国有4种,其中仅龙眼一种在我国作为果树栽培。龙眼系二倍体,2n=30,主产地在我国东南至西南部以及泰国北部。我国南部至西南部是龙眼主要原产地。近年来,在广东海南岛、云南西南部发现大面积的野生龙眼。仅云南西南部南亚热带区的六个县境内,已发现野生龙眼群落约七万余株,这 Longan as the Sapindus genus, the genus about 20 species, 4 species in our country, of which only a longan in our country as a fruit cultivation. Longan diploid, 2n = 30, the main origin in our southeast to southwestern and northern Thailand. South of our country to the southwest is the main origin of longan. In recent years, a large area of ​​wild longan has been found in Hainan Island, Guangdong Province and southwestern Yunnan Province. Within the six counties in the south subtropical zone of southwestern Yunnan, about 70,000 wild longan communities have been found, which