Pinus strobiformis
Pinus resinosa
Chihuahua white pine, Mexican white pine, pino enano, Southwestern white pine
Norway pine, pin rouge, red pine
gray, aging red-brown, furrowed, with narrow, irregular, scaly ridges.
light red-brown, furrowed and cross-checked into irregularly rectangular, scaly plates.
spreading-ascending;
twigs slender, pale red-brown, puberulous or glabrous, sometimes glaucous, aging gray or gray-brown, smooth.
spreading-ascending;
twigs moderately slender (to 1cm thick), orange- to red-brown, aging darker brown, rough.
ellipsoid, red-brown, ca. 1cm, resinous.
ovoid-acuminate, red-brown, to ca. 2cm, resinous;
scale margins fringed.
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, straight or slightly twisted, brittle, breaking cleanly when bent, deep yellow-green, all surfaces with narrow stomatal bands, margins serrulate, apex short-conic, acute;
sheath 1–2.5cm, base persistent.
cylindric, ca. 6–10mm, pale yellow-brown.
ellipsoid, ca. 15mm, dark purple.
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 and opening in 2 years, spreading, symmetric, ovoid before opening, broadly ovoid to nearly globose when open, 3.5–6cm, light red-brown, nearly sessile;
apophyses slightly thickened, slightly raised, transversely low-keeled;
umbo central, centrally depressed, unarmed.
=24.
=24.
Pinus strobiformis
Pinus resinosa
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 resinosa was once the most important timber pine in the Great Lakes region.
Norway pine (Pinus resinosa) is the state tree of Minnesota.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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