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bristlecone pine, Great Basin bristlecone pine, intermountain bristlecone pine

Habit Trees to 16m; trunk to 2m diam., strongly tapering; crown rounded, flattened (sheared), or irregular.
Bark

red-brown, shallowly to deeply fissured with thick, scaly, irregular, blocky ridges.

Branches

contorted, pendent;

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

Buds

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

Leaves

mostly 5 per fascicle, upcurved, persisting 10–30 years, 1.5–3.5cm × 0.8–1.2mm, mostly connivent, deep yellow-green, with few resin splotches but often scurfy with pale scales, abaxial surface without median groove but with 2 subepidermal but evident resin bands, adaxial surfaces conspicuously whitened with stomates, margins entire or remotely and finely serrulate distally, apex bluntly acute to short-acuminate;

sheath ca. 1cm, soon forming rosette, shed early.

Pollen cones

cylindro-ellipsoid, 7–10mm, purple-red.

Seed(s)

cones maturing in 2 years, shedding seeds and falling soon thereafter, spreading, symmetric, lance-cylindric with rounded base before opening, lance-cylindric to narrowly ovoid when open, 6–9.5cm, purple, aging red-brown, nearly sessile;

apophyses much thickened, sharply keeled;

umbo central, raised on low buttress, truncate to umbilicate, abruptly narrowed to slender but stiff, variable prickle 1–6mm, resin exudate pale.

Pinus longaeva

Habitat Subalpine and alpine
Elevation 1700–3400m (5600–11200ft)
Distribution
from FNA
CA; NV; UT
[WildflowerSearch map]
[BONAP county map]
Discussion

Pinus longaeva is considered by dendrochronologists to be the longest-lived tree. One tree was estimated to be 5000 years old.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 2.
Parent taxa 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. flexilis, P. glabra, P. jeffreyi, P. lambertiana, P. leiophylla, 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 P. aristata var. longaeva
Name authority D. K. Bailey: Ann. Missouri Bot. Gard. 57: 243. (1970)
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