Indonesia: langsat, duku, kokosan
Philippines: lansones, boboa, buahan
Malaysia: langsat, duku, duku-langsat
Thailand: langsat, duku, longkong
Origin and Distribution
Langsat is native to Thailand, Malaysia and Indonesia. Although it is planted sporadically throughout the tropics, commercial production is mostly in Thailand, Malaysia, Indonesia, the Philippines, and Vietnam.
Aglaia dookoo, Aglaia domestica, and Aglaia aquea.
Langsat is a medium to large tree, cultivated trees usually 15-30 feet (5-10 m) tall, while seedling trees can reach 90 feet (27 m) or more in height. The trunk is generally straight and the branched relatively open. The leaves are alternate and compound, around 9-20 inches (23-51 cm) long, with 5-7 leaflets. The perfect flowers are small and white, and borne on cauliflorous spikes 4-12 inches (10-31 cm) long that emerge from older branches. Fruits are spheroid, ellipsoid, or ovoid, around 1-2 inches (2.5-5 cm) in diameter, and occur in clusters of 4-40. The yellowish peel is easily removed to reveal whitish translucent, aromatic, juicy pulp divided into 5-6 segments. The flavor is reminiscent of sweet grapefruit. Fruits usually contain 1-3 greenish seeds.
Propagation and Culture
Langsat may be propagated by seeds, cuttings, airlayers or grafting. Seeds must be planted fresh, as they lose viability rapidly if allowed to dry out. Germination occurs in 2-3 weeks, and the seedlings are slow growing. Trees may be grafted at about 1 year of age, or when the trunk is about the diameter of a pencil. They can be grafted by cleft, side veneer, bud, or approach.
Young trees should have 50% shade for the first 2-3 years. Langsat trees prefer moist, fertile soil and high relative humidity for best growth. Since they are slow growing, they are often interplanted with other fruit trees. They require tropical conditions, and will grow from sea level to 2,400 feet (732 m) elevation. Seedling trees may take 10-30 years or more to fruit, while grafts or airlayers can fruit in 5-6 years with good care. A mature tree can produce from 90-650 pounds (41-308 kg) of fruit per year. In Puerto Rico, langsat fruits from August to October.
Cultivars and Related Species
Lansium domesticum is a highly variable species,
with different forms that have been classified by some taxonomists as distinct
species. There are five basic varieties, but there may be intermediate
forms with overlapping characteristics:
There are about 15 species in the genus Lansium. Lansium membranaceum, from Indonesia, has an edible but sour fruit up to 1.6 inches (4 cm) long.
Langsat fruits are usually eaten fresh, but may be canned in syrup.
Nutritional composition per 100 g langsat fruit
Several parts of the plant have medicinal uses. The fruit peel is dried and burned to repel mosquitoes; it is also used to treat intestinal parasites and diarrhea. Powdered seeds are used to reduce fever, and the bark is used to treat malaria and scorpion stings.
More information on langsat
(Lansium domesticum Corr.)
duku, duku-langsat and dokong
Gardens, Hwy 120 Km 18.9, Box 692, Maricao, Puerto Rico 00606 USA
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