Pinus strobiformis
Pinus banksiana
Chihuahua white pine, Mexican white pine, pino enano, Southwestern white pine
Jack pine, pin gris, scrub pine
gray, aging red-brown, furrowed, with narrow, irregular, scaly ridges.
orange- to red-brown, scaly.
spreading-ascending;
twigs slender, pale red-brown, puberulous or glabrous, sometimes glaucous, aging gray or gray-brown, smooth.
descending to spreading-ascending, poorly self-pruning;
twigs slender, orange-red to red-brown, aging gray-brown, rough.
ellipsoid, red-brown, ca. 1cm, resinous.
ovoid, red-brown, 0.5–1cm, resinous;
scale margins nearly entire.
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.
2 per fascicle, spreading or ascending, persisting 2–3 years, 2–5cm × 1–1.5(–2)mm, twisted, yellow-green, all surfaces with fine stomatal lines, margins finely serrulate, apex acute to short-subulate;
sheath 0.3–0.6cm, semipersistent.
cylindric, ca. 6–10mm, pale yellow-brown.
cylindric, 10–15mm, yellow to orange-brown.
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.
cones maturing in 2 years, shedding seeds soon thereafter or often long-serotinous and shedding seeds only through age or fire, upcurved, asymmetric, lanceoloid before opening, ovoid when open, 3–5.5cm, tan to light brown or greenish yellow, slick, nearly sessile or short-stalked, most apophyses depressed but increasingly mammillate toward outer cone base;
umbo central, depressed, small, sunken centrally, unarmed or with a small, reflexed apiculus.
=24.
=24.
Pinus strobiformis
Pinus banksiana
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.)
Pinus banksiana reaches its largest size and best form in Canada. In western Alberta and in northeastern British Columbia, it is sympatric with P. contorta and forms hybrid swarms with that species.
Jack pine (Pinus banksiana) is the territorial tree of the Northwest Territories.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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