Pinus monophylla

Torrey & Frémont

in Frémont, Rep. Exped. Rocky Mts. 2: 319, plate 4. 1845.

Common names: Singleleaf pinyon piñón
Synonyms: Caryopitys monophylla (Torrey & Frémont) Rydberg Pinus californiarum D.K.Bailey Pinus cembroides var. monophylla (Torrey & Frémont) Voss
Treatment appears in FNA Volume 2.

Trees to 14m; trunk to 0.5m diam., strongly tapering, much branched; crown usually rounded, dense. Bark red-brown, irregularly furrowed or cross-checked, scaly. Branches spreading and ascending, persistent to near trunk base; twigs stout, orange-brown, aging brown to gray, sometimes sparsely puberulent. Buds ellipsoid, light red-brown, 0.5–0.7cm, resinous; scale margins fringed. 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. Pollen cones ellipsoid, ca. 10mm, yellow. Seed 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. Seeds cylindric-ellipsoid; body 15–20mm, gray-brown to brown, wingless. 2n =24.

Habitat: Dry low-montane or foothill pinyon-juniper woodland
Elevation: 1000–2300m


V2 55-distribution-map.gif

Ariz., Calif., Idaho, Nev., Utah, Mexico in Baja California.


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

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

Selected References


Lower Taxa

... more about "Pinus monophylla"
Robert Kral +
Torrey & Frémont +
Singleleaf pinyon +  and piñón +
Ariz. +, Calif. +, Idaho +, Nev. +, Utah +  and Mexico in Baja California. +
1000–2300m +
Dry low-montane or foothill pinyon-juniper woodland +
in Frémont, Rep. Exped. Rocky Mts. +
Illustrated +
Caryopitys monophylla +, Pinus californiarum +  and Pinus cembroides var. monophylla +
Pinus monophylla +
species +