38. Pinus strobus Linnaeus, Sp. Pl. 2: 1001. 1753.
北美乔松 bei mei qiao song
Trees to 65 m tall; trunk to 1.8 m d.b.h.; bark gray-brown, deeply furrowed, with irregularly oblong, long, scaly plates; crown conical, becoming rounded or flattened on top; winter buds light red-brown, ovoid-cylindric, slightly resinous. Needles 5 per bundle, not pendulous, deep green to blue-green, slightly twisted, 6-14 cm × 0.7-1 mm, pliant, stomatal lines present on all surfaces, base with early shed sheath 1-1.5 cm, margin finely serrulate. Seed cones clustered, pedunculate (peduncle 2-3 cm), gray-brown or pale brown with purple or gray tints, cylindric, ellipsoid, or lanceolate-cylindric when open, 7-20 cm, maturing in 2 years, then soon shedding seeds and falling. Apophyses slightly raised, apex resinous; umbo terminal. Seeds red-brown, black mottled, broadly and obliquely obovoid, compressed, 5-6 mm; wing pale brown, 1.8-2.5 cm.
Cultivated. Beijing Shi, Jiangsu (Nanjing Shi), Jiangxi (Lu Shan), Liaoning [native to E Canada, Guatemala, S Mexico, E United States]