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limber pine, pin blanc de l'ouest

bristlecone pine, Colorado bristlecone pine, Rocky Mountain bristlecone pine

Habit Trees to 26m; trunk to 2m diam., straight to contorted; crown conic, becoming rounded. Trees to 15m; trunk to 1m diam., strongly tapering, twisted; crown rounded, flattened (sheared), or irregular.
Bark

gray, nearly smooth, cross-checked in age into scaly plates and ridges.

gray to red-brown, shallowly fissured, with long, flat, irregular ridges.

Branches

spreading to ascending, often persistent to trunk base;

twigs pale red-brown, puberulous (rarely glabrous), slightly resinous, aging gray, smooth.

contorted;

twigs pale red-brown, aging gray, puberulent, young branches resembling long bottlebrushes because of persistent leaves.

Buds

ovoid, light red-brown, 0.9–1cm, resinous;

lower scales ciliolate along margins.

ovoid-acuminate, pale red-brown, ca. 1cm, resinous.

Leaves

5 per fascicle, spreading to upcurved and ascending, persisting 5–6 years, 3–7cm × 1–1.5mm, pliant, dark green, abaxial surface with less conspicuous stomatal bands than adaxial surfaces, adaxial surfaces with strong, pale stomatal bands, margins finely serrulate, apex conic-acute to acuminate;

sheath 1–1.5(–2)cm, 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

broadly ellipsoid-cylindric, ca. 15mm, pale red or yellow.

ellipsoid, ca. 10mm, bluish to red.

Seed(s)

cones maturing in 2 years, shedding seeds and falling soon thereafter, spreading, symmetric, lance-ovoid before opening, cylindro-ovoid when open, 7–15cm, straw-colored, resinous, sessile to short-stalked, apophyses much thickened, strongly cross-keeled, 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 flexilis

Pinus aristata

Habitat High montane forests, often at timberline Subalpine and alpine
Elevation (1000–)1500–3600m ((3300–)4900–11800ft) 2500–3400m (8200–11200ft)
Distribution
from FNA
AZ; CA; CO; ID; MT; ND; NE; NM; NV; OR; SD; UT; WY; AB; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CO; NM
[WildflowerSearch map]
[BONAP county map]
Discussion

Pinus flexilis, much branched with a strongly tapering trunk, is little utilized because of its form and relative inaccessibility. It reportedly forms intermediates with P. strobiformis where the two overlap. The fresh-cut wood has the odor of turpentine.

(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
P. albicaulis, P. aristata, P. attenuata, P. balfouriana, P. banksiana, P. cembroides, P. clausa, P. contorta, P. coulteri, P. echinata, P. edulis, P. elliottii, P. engelmannii, P. glabra, P. jeffreyi, P. lambertiana, P. leiophylla, P. longaeva, P. monophylla, P. monticola, P. muricata, P. palustris, P. ponderosa, P. pungens, P. quadrifolia, P. radiata, P. resinosa, P. rigida, P. sabiniana, P. serotina, P. strobiformis, P. strobus, P. sylvestris, P. taeda, P. torreyana, P. virginiana, P. washoensis
P. albicaulis, P. attenuata, P. balfouriana, P. banksiana, P. cembroides, P. clausa, P. contorta, P. coulteri, P. echinata, P. edulis, P. elliottii, P. engelmannii, P. flexilis, P. glabra, P. jeffreyi, P. lambertiana, P. leiophylla, P. longaeva, P. monophylla, P. monticola, P. muricata, P. palustris, P. ponderosa, P. pungens, P. quadrifolia, P. radiata, P. resinosa, P. rigida, P. sabiniana, P. serotina, P. strobiformis, P. strobus, P. sylvestris, P. taeda, P. torreyana, P. virginiana, P. washoensis
Synonyms Apinus flexilis P. balfouriana var. aristata
Name authority E. James: Account Exped. Pittsburgh 2: 27, 35. (1823) Engelmann: in Parry & Engelmann, Amer. J. Sci. Arts ser. 2, 34: 331. (1862)
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