Pinus strobiformis
Pinus lambertiana
Chihuahua white pine, Mexican white pine, pino enano, Southwestern white pine
sugar pine
gray, aging red-brown, furrowed, with narrow, irregular, scaly ridges.
cinnamon- to gray-brown, deeply furrowed, plates long, scaly.
spreading-ascending;
twigs slender, pale red-brown, puberulous or glabrous, sometimes glaucous, aging gray or gray-brown, smooth.
spreading, distal branches ascending;
twigs gray-green to red-tan, aging gray, mostly puberulent.
ellipsoid, red-brown, ca. 1cm, resinous.
cylindro-ovoid, red-brown, to 0.8cm, resinous.
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.
5 per fascicle, spreading to ascending, persisting 2–4 years, 5–10cm × (0.9–)1–1.5(–2)mm, straight, slightly twisted, pliant, blue-green, abaxial surface with only a few lines evident, adaxial surfaces with evident white stomatal lines, margins finely serrulate, apex acuminate;
sheath (1–)1.5–2cm, shed early.
cylindric, ca. 6–10mm, pale yellow-brown.
ellipsoid-cylindric, to 15mm, yellow.
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 and falling soon thereafter, often clustered, pendent, symmetric, cylindric before opening, lance-cylindric to ellipsoid-cylindric when open, 25–50cm, yellow-brown, stalks 6–15cm;
apophyses somewhat thickened;
umbo terminal, depressed, resinous, slightly excurved.
=24.
=24.
Pinus strobiformis
Pinus lambertiana
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.)
The largest species of the genus, Pinus lambertiana also has the longest seed cone in the genus. It is an important timber tree with harvest far exceeding regrowth. It is easily distinguished from P. monticola and P. strobus by its larger cones and thicker cone scales with larger seeds; it is somewhat less reliably distinguished by its leaves, which are slightly wider and more tapering-tipped and have some stomatal lines evident on the abaxial surfaces (the lines not evident in P. monticola and P. strobus). A "sugary" resin high in cyclitols exudes from the sweet-scented fresh-cut wood.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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