Pinus monophylla |
Pinus aristata |
|
---|---|---|
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 |
AZ; CA; ID; NV; UT; Mexico in Baja California
|
AZ; CO; NM
|
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 | ||
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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