6. Pinus latteri Mason, J. Asiat. Soc. Bengal. 18: 74. 1849.
南亚松 nan ya song
Pinus ikedae Yamamoto; P. merkusii Junghuhn & de Vriese subsp. latteri (Mason) D. Z. Li; P. merkusii var. latteri (Mason) Silba; P. merkusii var. tonkinensis (A. Chevalier) Gaussen ex Bui; P. tonkinensis A. Chevalier.
Trees to 30 m tall; trunk to 2 m d.b.h.; bark gray-brown, thick, scaly; crown globose or umbrellalike; branchlets dark brown, glabrous; winter buds brown, cylindric. Needles 2 per bundle, semiorbicular in cross section, 15-27 cm × ca. 1.5 mm, stomatal lines present on all surfaces, resin canals 2, median, base with persistent sheath 1-2 cm. Seed cones pedunculate (peduncle ca. 1 cm), green, turning red-brown at maturity, conical or ovoid-cylindric, 5-10 cm. Seed scales oblong, ca. 3 × 1.2-1.5 cm; apophyses subrhombic or pentagonal-rhombic, slightly swollen, shiny, slightly recurved toward apex, flat toward base, obviously radially ridged; umbo usually slightly sunken. Seeds gray-brown, slightly appressed, ellipsoid-ovoid, 5-8 × ca. 4 mm; wing 1.7-2 cm. Pollination Mar-Apr, seed maturity Oct of 2nd year.
Hills, terraces; below 1200 m. SW Guangdong, S Guangxi, Hainan [Cambodia, Laos, SE Myanmar, Thailand, Vietnam]
The timber is used for construction, bridge building, and making poles and instruments. The trunk can be used as a source of resin, the bark for tannin, and the needles for turpentine.