Trees to 50 m tall; trunk to 1 m d.b.h.; bark dark brown or gray-brown, flaking; 1st-year branchlets pale brown (drying dark red-brown), rarely glaucous, slender, glabrous, longitudinally furrowed; winter buds cylindric-conical or ovoid, slightly resinous. Needles 5 per bundle, slender, triangular in cross section, 5-18 cm × 0.5-0.7 cm, flexible, vascular bundle 1, resin canals 3, 2 marginal and 1 median. Seed cones solitary or 2-4 clustered at base of branchlets, pedunculate (peduncle 1-2 cm), green, maturing to yellow-brown, narrowly ovoid, ellipsoid-ovoid, or cylindric-ellipsoid, 6-14 × 3-6 cm, usually resinous, dehiscent. Seed scales almost cuneate or oblong-obovoid, 2-2.5 × 1.5-2 cm at middle of cone; apophyses broadly subrhombic, distal margin obviously reflexed, apex thickened. Seeds chestnut or pale brown, obovoid-ellipsoid, 0.8-1.5 cm × 5-8 mm; seed coat thin; wing rudimentary, 2-4(-7) mm or much shorter. Pollination Apr, seed maturity Oct-Nov of 2nd year.