Pinus virginiana
Pinus strobiformis
Jersey pine, scrub pine, Virginia pine
Chihuahua white pine, Mexican white pine, pino enano, Southwestern white pine
gray-brown with irregular, scaly-plated ridges, on upper sections of trunk reddish, scaly.
gray, aging red-brown, furrowed, with narrow, irregular, scaly ridges.
spreading-ascending to spreading-descending;
twigs slender, red- or purple-tinged, often glaucous, aging red-brown to gray, rough.
spreading-ascending;
twigs slender, pale red-brown, puberulous or glabrous, sometimes glaucous, aging gray or gray-brown, smooth.
ovoid to cylindric, red-brown, 0.6–1cm, resinous or not resinous;
scale margins white-fringed.
ellipsoid, red-brown, ca. 1cm, resinous.
2 per fascicle, spreading or ascending, persisting 3–4 years, 2–8cm × 1–1.5mm, strongly twisted, deep to pale yellow-green, all surfaces with inconspicuous stomatal lines, margins serrulate, apex narrowly acute;
sheath 0.4–1cm, base persistent.
5 per fascicle, spreading to ascending-upcurved, persisting 3–5 years, 4–9cm × 0.6–1mm, straight, slightly twisted, pliant, dark green to blue-green, abaxial surface without evident stomatal lines, adaxial surfaces conspicuously whitened by narrow stomatal lines, margins sharp, razorlike and entire to finely serrulate, apex narrowly acute to short-subulate;
sheath 1.5–2cm, shed early.
ellipsoid-cylindric, 10–20mm, red-brown or yellow.
cylindric, ca. 6–10mm, pale yellow-brown.
cones maturing in 2 years, shedding seeds soon thereafter, persisting to 5 years, symmetric, lance-ovoid or lanceoloid before opening, ovoid when open, 3–7(–8)cm, dull red-brown, nearly sessile or on stalks to 1cm, scales rigid, with strong purple-red or purple-brown border on adaxial surface distally;
apophyses slightly thickened, slightly elongate;
umbo central, low-pyramidal, with slender, stiff prickle.
cones maturing in 2 years, shedding seeds and falling soon thereafter, pendent, symmetric, lance-cylindric before opening, broadly lance-cylindric when open, 15–25cm, creamy brown to light yellow-brown, stalks to 6cm;
apophyses somewhat thickened, strongly cross-keeled, tip reflexed;
umbo terminal, low.
=24.
=24.
Pinus virginiana
Pinus strobiformis
Pinus virginiana is weedy and fire successional and often forms large stands. It is mostly too small and too profusely branched to be valued except as pulpwood.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
In the northern part of the range, Pinus strobiformis overlaps P. flexilis and reportedly hybridizes with it. On average P. strobiformis has longer, more slender leaves and thinner, more spreading-tipped apophyses than are found in P. flexilis, and stomatal bands are not evident on the abaxial surface of its leaves.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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