Pinus ponderosa |
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bull pine, pin à bois lourd, pinabete, pino real, ponderosa pine, western yellow pine, yellow pine |
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Habit | Trees to 72m; trunk to 2.5m diam., straight; crown broadly conic to rounded. | ||||||||
Bark | yellow- to red-brown, deeply irregularly furrowed, cross-checked into broadly rectangular, scaly plates. |
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Branches | descending to spreading-ascending; twigs stout (to 2cm thick), orange-brown, aging darker orange-brown, rough. |
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Buds | ovoid, to 2cm, fully 1cm broad, red-brown, very resinous; scale margins white-fringed. |
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Leaves | 2–5 per fascicle, spreading to erect, persisting (2–)4–6(–7) years, 7–25(–30)cm × (1–)1.2–2mm, slightly twisted, tufted at twig tips, pliant, deep yellow-green, all surfaces with evident stomatal lines, margins serrulate, apex abruptly to narrowly acute or acuminate; sheath 1.5–3cm, base persistent. |
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Pollen cones | ellipsoid-cylindric, 1.5–3.5cm, yellow or red. |
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Seed(s) | cones maturing in 2 years, shedding seeds soon thereafter, leaving rosettes of scales on branchlets, solitary or rarely in pairs, spreading to reflexed, symmetric to slightly asymmetric, conic-ovoid before opening, broadly ovoid when open, 5–15cm, mostly reddish brown, sessile to nearly sessile, scales in steep spirals (as compared to Pinus jeffreyi) of 5–7 per row as viewed from side, those of cones just prior to and after cone fall spreading and reflexed, thus well separate from adjacent scales; apophyses dull to lustrous, thickened and variously raised and transversely keeled; umbo central, usually pyramidal to truncated, rarely depressed, merely acute, or with a very short apiculus, or with a stout-based spur or prickle. |
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Pinus ponderosa |
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Distribution |
AZ; CA; CO; ID; MT; ND; NE; NM; NV; OK; OR; SD; TX; UT; WA; WY; BC; Mexico
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Discussion | Pinus ponderosa is the most economically important western yellow pine. Its wood is more similar in character to the white pines, and it is often referred to as white pine. The taxonomy of this complex is far from resolved. Ponderosa pine (Pinus ponderosa) is the state tree of Montana. Varieties 3 (3 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. | ||||||||
Parent taxa | Pinaceae > Pinus | ||||||||
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Name authority | Douglas ex Lawson & C. Lawson: Agric. Man. 354. (1836) | ||||||||
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