Pinus strobus L.
White pine
Species recognized by Aljos Farjon, Conifer Database in
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Description
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Flora of North America Editorial Committee
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Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
Trees to 67m; trunk to 1.8m diam., straight; crown conic, becoming rounded to flattened. Bark gray-brown, deeply furrowed, with long, irregularly rectangular, scaly plates. Branches whorled, spreading-upswept; twigs slender, pale red-brown, glabrous or pale puberulent, aging gray, ±smooth. Buds ovoid-cylindric, light red-brown, 0.4--0.5cm, slightly resinous. Leaves 5 per fascicle, spreading to ascending, persisting 2--3 years, 6--10cm ´ 0.7--1mm, straight, slightly twisted, pliant, deep green to blue-green, pale stomatal lines evident only on adaxial surfaces, margins finely serrulate, apex abruptly acute to short-acuminate; sheath 1--1.5cm, shed early. Pollen cones ellipsoid, 10--15mm, yellow. Seed cones maturing in 2 years, shedding seeds and falling soon thereafter, clustered, pendent, symmetric, cylindric to lance-cylindric or ellipsoid-cylindric before opening, ellipsoid-cylindric to cylindric or lance-cylindric when open, (7--)8--20cm, gray-brown to pale brown, with purple or gray tints, stalks 2--3cm; apophyses slightly raised, resinous at tip; umbo terminal, low. Seeds compressed, broadly obliquely obovoid; body 5--6mm, red-brown mottled with black; wing 1.8--2.5cm, pale brown. 2 n =24.
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Flora of North America Editorial Committee
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Citation
Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
Pinus strobus is an important timber tree; because of extensive lumbering, few uncut stands remain. It was once prized as a source for ship masts, and large tracts of it were reserved for the Royal Navy during colonial times.
Pinus strobus var. chiapensis appears to be as Martínez saw it: a clinal variant that, compared to the type variety, has finer leaves, different resin canal distribution, and heavier cones when cones of similar sizes are compared.
Eastern white pine ( Pinus strobus ) is the provincial tree of Ontario and the state tree of Maine and Michigan.
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Wu Zhengyi, Peter H. Raven & Hong Deyuan
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Flora of China Vol. 4: 25 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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.
