Pinus strobiformis |
Pinus sylvestris |
|
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Chihuahua white pine, Mexican white pine, pino enano, Southwestern white pine |
pin d'écosse, Scotch pine, Scots pine |
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Habit | Trees to 30m; trunk to 0.9m diam., slender, straight; crown conic, becoming rounded to irregular. | |
Bark | gray, aging red-brown, furrowed, with narrow, irregular, scaly ridges. |
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Branches | spreading-ascending; twigs slender, pale red-brown, puberulous or glabrous, sometimes glaucous, aging gray or gray-brown, smooth. |
|
Buds | ellipsoid, red-brown, ca. 1cm, resinous. |
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Leaves | 5 per fascicle, spreading to ascending-upcurved, persisting 3–5 years, 4–9cm × 0.6–1mm, straight, slightly twisted, pliant, dark green to blue-green, abaxial surface without evident stomatal lines, adaxial surfaces conspicuously whitened by narrow stomatal lines, margins sharp, razorlike and entire to finely serrulate, apex narrowly acute to short-subulate; sheath 1.5–2cm, shed early. |
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Pollen cones | cylindric, ca. 6–10mm, pale yellow-brown. |
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Seed(s) | cones maturing in 2 years, shedding seeds and falling soon thereafter, pendent, symmetric, lance-cylindric before opening, broadly lance-cylindric when open, 15–25cm, creamy brown to light yellow-brown, stalks to 6cm; apophyses somewhat thickened, strongly cross-keeled, tip reflexed; umbo terminal, low. |
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2n | =24. |
|
Pinus strobiformis |
Pinus sylvestris |
|
Habitat | Arid to moist summit elevations, montane forests | |
Elevation | 1900–3000m (6200–9800ft) | |
Distribution |
AZ; NM; TX; n Mexico
|
North America; Eurasia
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Discussion | In the northern part of the range, Pinus strobiformis overlaps P. flexilis and reportedly hybridizes with it. On average P. strobiformis has longer, more slender leaves and thinner, more spreading-tipped apophyses than are found in P. flexilis, and stomatal bands are not evident on the abaxial surface of its leaves. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties ca. 20 (1 introduced in the flora). (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 | ||
Subordinate taxa | ||
Synonyms | P. ayacahuite var. brachyptera, P. ayacahuite var. reflexa, P. ayacahuite var. strobiformis, P. flexilis var. reflexa, P. reflexa | |
Name authority | Engelmann: in Wislizenus, Mem. Tour N. Mexico 102. (1848) | Linnaeus: Sp. Pl. 2: 1000. (1753) |
Web links |