Pinus monophylla |
Pinus elliottii |
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piñón, single leaf pinyon, single-leaf pine, singleleaf pinyon pine |
slash pine |
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Habit | Trees to 14m; trunk to 0.5m diam., strongly tapering, much branched; crown usually rounded, dense. | Trees to 30m; trunk to 0.8m diam., straight to contorted; crown conic, becoming rounded or flattened. | ||||
Bark | red-brown, irregularly furrowed or cross-checked, scaly. |
orange- to purple-brown, irregularly furrowed and cross-checked into large, irregularly rectangular, papery-scaly plates. |
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Branches | spreading and ascending, persistent to near trunk base; twigs stout, orange-brown, aging brown to gray, sometimes sparsely puberulent. |
spreading to ascending; twigs stout (to ca. 1cm thick), orange-brown, aging darker brown, rough-scaly. |
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Buds | ellipsoid, light red-brown, 0.5–0.7cm, resinous; scale margins fringed. |
cylindric, silvery brown, 1.5–2cm; scale margins fringed. |
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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. |
2 or 3 per fascicle, spreading or ascending, persisting ca. 2 years, 15–20(–23)cm × 1.2–1.5mm, straight, slightly twisted, pliant, yellow- to blue-green, all surfaces with stomatal lines, margins finely serrulate, apex abruptly acute to acuminate; sheath 1–2cm, base persistent. |
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Pollen cones | ellipsoid, ca. 10mm, yellow. |
cylindric, 30–40mm, purplish. |
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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, falling the year after seed-shed, single or in pairs, symmetric, lance-ovoid before opening, ovoid or ovoid-cylindric when open, (7–)9–18(–20)cm, light chocolate brown, on stalks to 3cm; apophyses lustrous (as if varnished), slightly raised, strongly cross-keeled; umbo central, depressed-pyramidal, with short, stout prickle. |
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2n | =24. |
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Pinus monophylla |
Pinus elliottii |
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Habitat | Dry low-montane or foothill pinyon-juniper woodland | |||||
Elevation | 1000–2300m (3300–7500ft) | |||||
Distribution |
AZ; CA; ID; NV; UT; Mexico in Baja California
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AL; FL; GA; LA; MS; SC [Introduced in subtropical and warm temperate areas worldwide]
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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.) |
Varieties 2 (native only in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 2. | FNA vol. 2. | ||||
Parent taxa | Pinaceae > Pinus | Pinaceae > Pinus | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Caryopitys monophylla, P. californiarum, P. cembroides var. monophylla | P. heterophylla, P. taeda var. heterophylla | ||||
Name authority | Torrey & Frémont: in Frémont, Rep. Exped. Rocky Mts. 2: 319, plate 4. (1845) | Engelmann: Trans. Acad. Sci. St. Louis 4: 186, plates 1–3. (1880) | ||||
Web links |