Pinus jeffreyi
Pinus strobus
Jeffrey pine
eastern white pine, northern white pine, pin blanc, soft pine, Weymouth pine, white pine
yellow-brown to cinnamon, deeply furrowed and cross-checked, forming large irregular scaly plates.
gray-brown, deeply furrowed, with long, irregularly rectangular, scaly plates.
spreading-ascending;
twigs stout (to 2cm thick), purple-brown, often glaucous, aging rough.
whorled, spreading-upswept;
twigs slender, pale red-brown, glabrous or pale puberulent, aging gray, ±smooth.
ovoid, tan to pale red-brown, 2–3cm, not resinous;
scale margins conspicuously fringed.
ovoid-cylindric, light red-brown, 0.4–0.5cm, slightly resinous.
3 per fascicle, spreading-ascending, persisting (2–)4–6(–7) years, 12–22(–25)cm × ca. 1.5–2mm, slightly twisted, gray- to yellow-green, all surfaces with fine stomatal lines, margins finely serrulate, apex acute to acuminate;
sheath (1–)1.5–2.5(–3)cm, base persistent.
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.
lance-cylindric, 20–35mm, yellow to yellow- or purple-brown or yellow.
ellipsoid, 10–15mm, yellow.
cones maturing in 2 years, shedding seeds and falling soon thereafter, nearly terminal, spreading, slightly asymmetric at base, ovoid-conic before opening, cylindro-ovoid when open, (10–)15–30cm, light red-brown, nearly sessile or on stalks to 0.5cm, abaxial surface of scales not darker than or sharply contrasting in color with adaxial surface, scales in low spirals (as compared to Pinus ponderosa) of 8 or more per row as viewed from side, those of cones just prior to and after cone fall not so spreading and deflexed, thus not so much separated from adjacent scales;
apophyses slightly thickened and raised, not keeled;
umbo central, slightly raised, with short, slender, reflexed prickle.
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.
=24.
=24.
Pinus jeffreyi
Pinus strobus
Pinus jeffreyi has a form very similar to that of P. ponderosa, but it is a smaller species when compared with sympatric populations of the latter. It is cut and sold under the same name as P. ponderosa, but the sweetish odor of the fresh-cut wood contrasts sharply with the turpentine odor of ponderosa pine. The resin chemistry of the two species is significantly different.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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