Pinus monticola |
Pinus aristata |
|
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pin argenté, western white pine |
bristlecone pine, Colorado bristlecone pine, Rocky Mountain bristlecone pine |
|
Habit | Trees to 70m; trunk to 2.5m diam., straight; crown narrowly conic, becoming broad and flattened. | Trees to 15m; trunk to 1m diam., strongly tapering, twisted; crown rounded, flattened (sheared), or irregular. |
Bark | gray, distinctly platy, plates scaly. |
gray to red-brown, shallowly fissured, with long, flat, irregular ridges. |
Branches | nearly whorled, spreading-ascending; twigs slender, pale red-brown, rusty puberulent and slightly glandular (rarely glabrous), aging purple-brown or gray, smooth. |
contorted; twigs pale red-brown, aging gray, puberulent, young branches resembling long bottlebrushes because of persistent leaves. |
Buds | ellipsoid or cylindric, rust-colored, 0.4–0.5cm, slightly resinous. |
ovoid-acuminate, pale red-brown, ca. 1cm, resinous. |
Leaves | 5 per fascicle, spreading to ascending, persisting 3–4 years, 4–10cm × 0.7–1mm, straight, slightly twisted, pliant, blue-green, abaxial surface without evident stomatal lines, adaxial surfaces with evident stomatal lines, margins finely serrulate, apex broadly to narrowly acute; sheath 1–1.5cm, shed early. |
5 per fascicle, upcurved, persisting 10–17 years, (2–)3–4cm × 0.8–1mm, mostly connivent, deep blue-green, with drops and scales of resin, abaxial surface with strong, narrow median groove, adaxial surfaces conspicuously whitened by stomates, margins entire or distantly serrulate, apex conic-acute to conic-subulate; sheath 0.5–1.5cm, scales soon recurving, shed early. |
Pollen cones | ellipsoid, 10–15mm, yellow. |
ellipsoid, ca. 10mm, bluish to red. |
Seed(s) | cones maturing in 2 years, shedding seeds and falling soon thereafter, clustered, pendent, symmetric, lance-cylindric to ellipsoid-cylindric before opening, broadly lanceoloid to ellipsoid-cylindric when open, 10–25cm, creamy brown to yellowish, without purple or gray tints, resinous, stalks to 2cm; umbo terminal, depressed. |
cones maturing in 2 years, shedding seeds and falling soon thereafter, spreading, symmetric, lance-cylindric before opening, lance-ovoid to ovoid or cylindric when open, 6–11cm, purple to brown, nearly sessile; apophyses much thickened; umbo central, with triangular base, extended into slender, brittle prickle 4–10mm. |
2n | =24. |
=24. |
Pinus monticola |
Pinus aristata |
|
Habitat | Montane moist forests, lowland fog forests | Subalpine and alpine |
Elevation | 0–3000m (0–9800ft) | 2500–3400m (8200–11200ft) |
Distribution |
CA; ID; MT; NV; OR; WA; AB; BC
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AZ; CO; NM
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Discussion | Pinus monticola is the most important western source for matchwood. Its wood lacks the sugary exudates seen in P. lambertiana. Western white pine (Pinus monticola) is the state tree of Idaho. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Pinus aristata has leaves usually narrower and sharper than in P. longaeva and P. balfouriana, and the leaves almost always have a narrow, median groove on the abaxial surface. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 2. | FNA vol. 2. |
Parent taxa | Pinaceae > Pinus | Pinaceae > Pinus |
Sibling taxa | ||
Synonyms | Strobus monticola | P. balfouriana var. aristata |
Name authority | Douglas ex D. Don: in Lambert, Descr. Pinus [ed. 3] 2: unnumbered page between 144 and 145. (1832) | Engelmann: in Parry & Engelmann, Amer. J. Sci. Arts ser. 2, 34: 331. (1862) |
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