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

big-cone pine, Coulter pine

Habit Trees to 14m; trunk to 0.5m diam., strongly tapering, much branched; crown usually rounded, dense. Trees to 24m; trunk to 1m diam., straight to contorted; crown broad, thin, irregular.
Bark

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

dark gray-brown to near black, deeply furrowed, with long, scaly, irregularly anastomosing, rounded ridges.

Branches

spreading and ascending, persistent to near trunk base;

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

often ascending;

twigs stout to moderately slender, violet-brown, often glaucous, aging gray-brown, rough.

Buds

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

scale margins fringed.

ovoid, deep red-brown, 1.5(–3)cm, resinous;

scale margins white-fringed, apex cuspidate.

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.

3 per fascicle, slightly spreading, not drooping, mostly ascending in a brush, persisting 3–4 years, 15–30cm × ca. 2mm, slightly curved or straight, twisted, dusty gray-green, all surfaces with pale, fine stomatal lines, margins serrulate, apex abruptly subulate;

sheath 2–4cm, base persistent.

Pollen cones

ellipsoid, ca. 10mm, yellow.

ovoid to cylindric, to 25mm, light purple-brown, aging orange-brown.

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, gradually shedding seeds thereafter and moderately persistent, massive, heavy, drooping, asymmetric at base, narrowly ovoid before opening, ovoid-cylindric when open, 20–35cm, pale yellow-brown, resinous, stalks to 3cm;

apophyses transverse-rhombic, strongly and sharply cross-keeled, elongate, curved, continuous with umbos to form long, upcurved claws 2.5–3cm.

2n

=24.

=24.

Pinus monophylla

Pinus coulteri

Habitat Dry low-montane or foothill pinyon-juniper woodland Dry rocky slopes, flats, ridges, and chaparral, transitional to oak-pine woodland
Elevation 1000–2300m (3300–7500ft) 300–2100m (1000–6900ft)
Distribution
from FNA
AZ; CA; ID; NV; UT; Mexico in Baja California
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; Mexico in Baja California
[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 coulteri is the heaviest-coned pine; one who seeks its shade should wear a hardhat.

(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. aristata, P. attenuata, P. balfouriana, P. banksiana, P. cembroides, P. clausa, P. contorta, 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
Name authority Torrey & Frémont: in Frémont, Rep. Exped. Rocky Mts. 2: 319, plate 4. (1845) D. Don: Trans. Linn. Soc. London, Bot. 17: 440. (1836)
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