Pinus flexilis
Pinus glabra
limber pine, pin blanc de l'ouest
bottom white pine, cedar pine, spruce pine, Walter pine
gray, nearly smooth, cross-checked in age into scaly plates and ridges.
gray, fissured and cross-checked into elongate, irregular, scaly plates, resin pockets absent, on upper sections of trunk ± smooth, gray, looking slick.
spreading to ascending, often persistent to trunk base;
twigs pale red-brown, puberulous (rarely glabrous), slightly resinous, aging gray, smooth.
whorled, spreading to ascending;
twigs slender, purple-red to red-brown, occasionally glaucous, aging gray, smooth.
ovoid, light red-brown, 0.9–1cm, resinous;
lower scales ciliolate along margins.
ovoid to ovoid-cylindric, red-brown, ca. 0.5–1cm, slightly resinous;
scale margins finely fringed.
5 per fascicle, spreading to upcurved and ascending, persisting 5–6 years, 3–7cm × 1–1.5mm, pliant, dark green, abaxial surface with less conspicuous stomatal bands than adaxial surfaces, adaxial surfaces with strong, pale stomatal bands, margins finely serrulate, apex conic-acute to acuminate;
sheath 1–1.5(–2)cm, shed early.
2 per fascicle, spreading to ascending, persisting 2–3 years, 4–8(–10)cm × 0.7–1.2mm, straight, slightly twisted, dark green, all surfaces with fine stomatal lines, margins finely serrulate, apex sharply conic;
sheath 0.5–1cm, base persistent.
broadly ellipsoid-cylindric, ca. 15mm, pale red or yellow.
lance-cylindric, 10–15mm, purple-brown.
cones maturing in 2 years, shedding seeds and falling soon thereafter, spreading, symmetric, lance-ovoid before opening, cylindro-ovoid when open, 7–15cm, straw-colored, resinous, sessile to short-stalked, apophyses much thickened, strongly cross-keeled, umbo terminal, depressed.
cones maturing in 2 years, shedding seeds soon thereafter, semipersistent, spreading to recurved, nearly symmetric, lance-ovoid before opening, ovoid-cylindric when open, 3.5–7cm, red-brown, aging gray, nearly sessile or on stalks to 1cm, scales lacking contrasting border on adaxial surfaces (as in P. echinata);
apophyses but slightly thickened and raised;
umbo central, depressed, unarmed or with small, curved, weak, deciduous, short-incurved prickle.
=24.
=24.
Pinus flexilis
Pinus glabra
Pinus flexilis, much branched with a strongly tapering trunk, is little utilized because of its form and relative inaccessibility. It reportedly forms intermediates with P. strobiformis where the two overlap. The fresh-cut wood has the odor of turpentine.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Pinus glabra is more shade tolerant than most yellow pines. Although the trees grow large, the wood is not much valued. The species is similar in tree form to P. strobus. It resembles P. echinata in shoot and leaf but has less prickly cones and deeper green leaves.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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