Dukulangsat/ lansium parasiticum (syn. lansium domesticum), also known as langsat (or lanzones, is a species of tree in the mahoganyfamily. the plant, which originates from western southeast asia, bears edible fruit. it is the provincial flower for the indonesian province of south sumatra.

this  fruit can be elliptical, oval, or round, measuring 2 to 7 centimetres (0.79 to 2.76 in) by 1.5 to 5 centimetres (0.59 to 1.97 in) in size. fruits look much like small potatoes and are borne in clusters similar to grapes. the larger fruits are on the variety known as duku. it is covered by thin, yellow hair giving a slightly fuzzy aspect. the skin thickness varies with the varieties, from 2 millimetres (0.079 in) to approximately 6 millimetres (0.24 in). the fruit contains 1 to 3 seeds, flat, and bitter tasting; the seeds are covered with a thick, clear-whitearil that tastes sweet and sour.the taste has been likened to a combination of grape and grapefruit and is considered excellent by most. the sweet juicy flesh contains sucrose, fructose, and glucose. for consumption, cultivars with small or undeveloped seeds an d thick aril are preferred.