Pinus monophylla
Pinus glabra
piñón, single leaf pinyon, single-leaf pine, singleleaf pinyon pine
bottom white pine, cedar pine, spruce pine, Walter pine
red-brown, irregularly furrowed or cross-checked, scaly.
gray, fissured and cross-checked into elongate, irregular, scaly plates, resin pockets absent, on upper sections of trunk ± smooth, gray, looking slick.
spreading and ascending, persistent to near trunk base;
twigs stout, orange-brown, aging brown to gray, sometimes sparsely puberulent.
whorled, spreading to ascending;
twigs slender, purple-red to red-brown, occasionally glaucous, aging gray, smooth.
ellipsoid, light red-brown, 0.5–0.7cm, resinous;
scale margins fringed.
ovoid to ovoid-cylindric, red-brown, ca. 0.5–1cm, slightly resinous;
scale margins finely fringed.
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.
2 per fascicle, spreading to ascending, persisting 2–3 years, 4–8(–10)cm × 0.7–1.2mm, straight, slightly twisted, dark green, all surfaces with fine stomatal lines, margins finely serrulate, apex sharply conic;
sheath 0.5–1cm, base persistent.
ellipsoid, ca. 10mm, yellow.
lance-cylindric, 10–15mm, purple-brown.
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 soon thereafter, semipersistent, spreading to recurved, nearly symmetric, lance-ovoid before opening, ovoid-cylindric when open, 3.5–7cm, red-brown, aging gray, nearly sessile or on stalks to 1cm, scales lacking contrasting border on adaxial surfaces (as in P. echinata);
apophyses but slightly thickened and raised;
umbo central, depressed, unarmed or with small, curved, weak, deciduous, short-incurved prickle.
=24.
=24.
Pinus monophylla
Pinus glabra
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 glabra is more shade tolerant than most yellow pines. Although the trees grow large, the wood is not much valued. The species is similar in tree form to P. strobus. It resembles P. echinata in shoot and leaf but has less prickly cones and deeper green leaves.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
LA Plants
