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piñón, single leaf pinyon, single-leaf pine, singleleaf pinyon pine

bristlecone pine, Colorado bristlecone pine, Rocky Mountain bristlecone pine

Habit Trees to 14m; trunk to 0.5m diam., strongly tapering, much branched; crown usually rounded, dense. Trees to 15m; trunk to 1m diam., strongly tapering, twisted; crown rounded, flattened (sheared), or irregular.
Bark

red-brown, irregularly furrowed or cross-checked, scaly.

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

Branches

spreading and ascending, persistent to near trunk base;

twigs stout, orange-brown, aging brown to gray, sometimes sparsely puberulent.

contorted;

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

Buds

ellipsoid, light red-brown, 0.5–0.7cm, resinous;

scale margins fringed.

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

Leaves

1(–2) per fascicle, ascending, persisting 4–6(–10) years, 2–6cm × 1.3–2(–2.5)mm, curved, terete (though often 2-grooved), gray-green, all surfaces with stomatal lines, margins entire, apex subulate;

sheath 0.5–1cm, scales soon recurved, forming rosette, 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, ca. 10mm, yellow.

ellipsoid, ca. 10mm, bluish to red.

Seed(s)

cones maturing in 2 years, shedding seeds and falling soon thereafter, spreading, symmetric, ovoid before opening, broadly depressed-ovoid to nearly globose when open, 4–6(–8)cm, pale yellow-brown, nearly sessile;

apophyses thickened, slightly raised;

umbo subcentral, raised or depressed, nearly truncate, apiculate.

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 monophylla

Pinus aristata

Habitat Dry low-montane or foothill pinyon-juniper woodland Subalpine and alpine
Elevation 1000–2300m (3300–7500ft) 2500–3400m (8200–11200ft)
Distribution
from FNA
AZ; CA; ID; NV; UT; Mexico in Baja California
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CO; NM
[WildflowerSearch map]
[BONAP county map]
Discussion

Pinus monophylla hybridizes with P. edulis and P. quadrifolia.

Singleleaf pinyon (Pinus monophylla) is the state tree of Nevada.

(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. flexilis, P. glabra, P. jeffreyi, P. lambertiana, P. leiophylla, P. longaeva, 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 Caryopitys monophylla, P. californiarum, P. cembroides var. monophylla P. balfouriana var. aristata
Name authority Torrey & Frémont: in Frémont, Rep. Exped. Rocky Mts. 2: 319, plate 4. (1845) Engelmann: in Parry & Engelmann, Amer. J. Sci. Arts ser. 2, 34: 331. (1862)
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