subgenusPinus, section, Pinus, subsectionPinus. This is one of the “classic” old-world, 2-needled, hard pines.
Pinus latteri, first described in 1849 by the Reverend F. Mason in, The pine tree of the Tenasserim Provinces, is commonly known as Tenasserim pine, as well as Thông nhựa, thông ta, thông hai lá, thông in the Vietnamese language; or 南亚松 (nan ya song) in Chinese. The species honors Captain T. Latter, regional Superintendent of Forests, thought to be the first Englishman to see the tree in habitat. Previously commonly treated as synonymous with P. merkusii (Jungh. et De Vriese), but now treated by most as a distinct species.
Description. Tenasserim pine is an evergreen, coniferous species of tree that grows to mature heights of 100 to 135 feet (30 - 45 m) with and open crown and level to upcurved branches, the crown changing from conical to rounded as the tree ages.
Bark is rough, colored gray-brown, deeply fissured, forming small rounded plates on the lower part of the trunk; thin and flaky in upper crown.
Branches mostly uninodal.
Leaves (needles) are borne in bundles of 2 per fascicle, each measuring 7.5 to 11 inches (19 - 27 cm) long, moderately slender and rigid with persistent sheaths.
Seed cones are borne singly or in pairs with short peduncles, measuring 2.6 to 5.2 inches (6.5 - 13 cm) long, elongate conic in shape with a rounded base before opening, colored green ripening glossy orange-brown.
Cone scales are large with a flat apophysis and a prominent transverse keel.
Seeds are medium-small, 0.4 inches (10 mm) long, with a long wing.
Seedlings develop from a grass stage.
Distribution. This species is native to Vietnam, Laos, Kampuchea, Thailand and southern Myanmar; as well as in extreme southern China (Hainan island), but possibly introduced there. It is found growing from sea level to the 2,000 feet (900 m) level, (mostly at lower altitudes than the sympatric P. kesiya but with some overlap), usually in open, savannah-like areas that are frequently burned by native peoples.
Hardy to USDA Zone 9 — cold hardiness limit between 20° and 30°F (-6.6° and -1.1°C).