Pinus flexilis
Pinus serotina
limber pine, pin blanc de l'ouest
marsh pine, pocosin pine, pond pine
gray, nearly smooth, cross-checked in age into scaly plates and ridges.
red-brown, irregularly furrowed and cross-checked into rectangular, flat, scaly plates.
spreading to ascending, often persistent to trunk base;
twigs pale red-brown, puberulous (rarely glabrous), slightly resinous, aging gray, smooth.
spreading to ascending;
twigs stout, orange- to yellow-orange, frequently glaucous, aging darker.
ovoid, light red-brown, 0.9–1cm, resinous;
lower scales ciliolate along margins.
ovoid to narrowly ovoid, red-brown, 1–1.5(–2)cm, resinous.
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.
3 per fascicle (to 5 in adventitious or disturbed growth), spreading to ascending, persisting 2–3 years, (12–)15–20(–21)cm × 1.3–1.5(–2)mm, slightly twisted, tufted at twig tips, straight, yellow-green, all surfaces with fine stomatal lines, margins serrulate, apex acuminate;
sheath 1–2cm, base persistent.
broadly ellipsoid-cylindric, ca. 15mm, pale red or yellow.
cylindric, to 30mm, yellow-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, in some populations beginning to shed seeds then but more often variably serotinous, long-persistent, often whorled, symmetric, ovoid to lanceoloid before opening, broadly ovoid to nearly globose when open, 5–8cm, pale red-brown to creamy brown, sessile or on stalks to 1cm, scales with dark red-brown border on adaxial surface distally;
apophyses slightly thickened, low, rhombic, low cross-keeled;
umbo central, low-conic, with short, weak prickle, sometimes unarmed.
=24.
=24.
Pinus flexilis
Pinus serotina
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 serotina is fire successional and sprouts adventitiously after crown fires. It is part of a distinct forest type including Taxodium distichum (Linnaeus) Richard, Nyssa biflora Walter, Magnolia virginiana Linnaeus, Persea sp., and Ilex sp. Of good form when protected from fire, P. serotina then much resembles P. taeda, with which it hybridizes naturally. It is of increasing importance as pulpwood.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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