Pinus monophylla

Torrey & Frémont in Frémont

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

Common names: Singleleaf pinyon piñón
Illustrated
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 redbrown, irregularly furrowed or cross-checked, scaly. Branches spreading and ascending, persistent to near trunk base; twigs stout, orangebrown, aging brown to gray, sometimes sparsely puberulent. Buds ellipsoid, light-redbrown, 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 yellowbrown, 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

Distribution

V2 55-distribution-map.gif

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

Discussion

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

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

Selected References

None.

Lower Taxa

None.

"relatively thin" is not a number.

... more about "Pinus monophylla"
resinous +
subulate +
Robert Kral +
Torrey & Frémont in Frémont +
cross-checked +  and furrowed +
gray-brown +  and brown +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
persistent +
ascending +  and spreading +
resinous +
light-redbrown +
conspicuous +
ellipsoid +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Singleleaf pinyon +  and piñón +
6 cm60 mm <br />0.06 m <br /> (8 cm80 mm <br />0.08 m <br />) +
pale yellowbrown +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
falling +  and maturing +
broadly depressed-ovoid +  and nearly globose +
rounded +
Ariz. +, Calif. +, Idaho +, Nev. +, Utah +  and Mexico in Baja California +
1000–2300m +
sheathed +  and sessile +
rounded +, 2-3-angled +  and terete +
Dry low-montane or foothill pinyon-juniper woodland +
sessile +  and short-petiolate +
arranged +  and fascicles +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
gray-green +
persisting +
2 cm20 mm <br />0.02 m <br /> (6 cm60 mm <br />0.06 m <br />) +
4 (?) +  and 6 (?) +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not winged +  and 2-winged +
10 cm100 mm <br />0.1 m <br /> (?) +
in Frémont,Rep. Exped. Rocky Mts. +
fibrous;woody +
arranged +  and overlapping +
persistent +
flattened +
pliable +  and woody +
grouped +  and solitary +
long-persistent +
wingless +, winged +, stalked +  and sessile +
persistent +
pendent;more or less erect +
cylindric-ellipsoid +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
reduced;well-defined short +
Illustrated +
extended +
Caryopitys monophylla +, Pinus californiarum +  and Pinus cembroides var. monophylla +
Pinus monophylla +
species +
decurrent +  and elongate +
tapering +
brown to gray +  and orangebrown +
puberulent +
apiculate +  and truncate +
subcentral +
depressed +
reduced +