Durian

The durian (pronounced /ˈdʊəriən/)^[1] is the fruit of trees from the genus Durio belonging to the Bombacaceae. Widely known and revered in Southeast Asia as the "King of Fruits", the fruit is distinctive for its large size, unique odour, and formidable thorn-covered husk. The fruit can grow up to 30 centimetres (12 in) long and 15 centimetres (6 in) in diameter, and typically weighs one to three kilograms (2 to 7 lb). Its shape ranges from oblong to round, the colour of its husk green to brown, and its flesh pale-yellow to red, depending on the species.

The edible flesh emits a distinctive odour, strong and penetrating even when the husk is intact. Regarded by some as fragrant, others as overpowering and offensive, the smell evokes reactions from deep appreciation to intense disgust. The odour has led to the fruit's banishment from certain hotels and public transportation in Southeast Asia.

The durian, native to Brunei, Indonesia and Malaysia, has been known to the western world for about 600 years. The British naturalist Alfred Russel Wallace famously described its flesh as "a rich custard highly flavoured with almonds" in the 19th century. The flesh can be consumed at various stages of ripeness, and is used to flavour a wide variety of savoury and sweet edibles in Southeast Asian cuisines. The seeds can also be eaten when cooked. The name durian comes from the Malay word duri (thorn) with suffix -an.

There are 30 recognised Durio species, at least nine of which produce edible fruit. Durio zibethinus is the only species available in the international market: other species are sold in their local regions. There are hundreds of durian cultivars; most of them have a common name and a code number starting with "D". Many consumers express preferences for specific cultivars, which fetch higher prices in the market.

Durian trees are relatively large, growing to 25–50 metres (80–165 ft) in height depending on the species.^[2] The leaves are evergreen, elliptic to oblong and 10–18 centimetres (4–7 in) long. The flowers are produced in three to thirty clusters together on large branches and directly on the trunk with each flower having a calyx (sepals) and five (rarely four or six) petals. Durian trees have one or two flowering and fruiting periods per year, though the timing varies depending on the species, cultivars, and localities. A typical durian tree can bear fruit after four or five years. The durian fruit can hang from any branch and matures roughly three months after pollination. The fruit can grow up to 30 centimetres (12 in) long and 15 centimetres (6 in) in diameter, and typically weighs one to three kilograms (2 to 7 lb).^[2] Its shape ranges from oblong to round, the colour of its husk green to brown, and its flesh pale-yellow to red, depending on the species.^[2] Among the thirty known species of Durio, nine of them have been identified as producing edible fruits: D. zibethinus, D. dulcis, D. grandiflorus, D. graveolens, D. kutejensis, D. lowianus, D. macrantha, D. oxleyanus and D. testudinarum.^[3] However, there are many species for which the fruit has never been collected or properly examined, so other species with edible fruit may exist.