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Pinus strobiformis Engelm.
MEXICAN WHITE-PINE
Pinus ayacahuite; Southwestern white pine; Pinus ayacahuite CA Ehrenb; Pinus reflexa (Engelm) Engelm

Life   Plantae   Gymnospermae   Pinaceae   Pinus

Pinus strobiformis, cone - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, cone - unspecified

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Pinus strobiformis, cone - female - mature open
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, cone - female - mature open
Pinus strobiformis, whole tree - general
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, whole tree - general

Pinus strobiformis, bark - of a medium tree or large branch
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, bark - of a medium tree or large branch
Pinus strobiformis, leaf - showing orientation on twig
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, leaf - showing orientation on twig

Pinus strobiformis, leaf - showing orientation on twig
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, leaf - showing orientation on twig
Pinus strobiformis, leaf - entire needle
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, leaf - entire needle

Pinus strobiformis, leaf - entire needle
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, leaf - entire needle
Pinus strobiformis, twig - showing attachment of needles
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, twig - showing attachment of needles

Pinus strobiformis, twig - showing attachment of needles
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, twig - showing attachment of needles
Pinus strobiformis, whole tree - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, whole tree - unspecified

Pinus strobiformis, whole plant - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, whole plant - unspecified
Pinus strobiformis, leaf - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, leaf - unspecified

Pinus strobiformis, whole plant - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, whole plant - unspecified
Pinus strobiformis, whole plant - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Pinus strobiformis, whole plant - unspecified

Associates · map
FamilyScientific name @ source (records)
Botryobasidiaceae  Botryobasidium subcoronatum @ BPI (1)
Dermateaceae  Atropellis @ BPI (2)

Cenangella @ BPI (1)

Cylindrosporium @ BPI (1)
Helotiaceae  Cenangium ferruginosum @ BPI (1)
Hyaloscyphaceae  Dasyscyphus arida @ BPI (1)
Membracidae  Cyrtolobus oblongatus @ UDCC_NRI (1)
Miridae  Dichrooscytus barberi @ AMNH_PBI (2)

Lopidea arizonae @ AMNH_PBI (1)

Phoenicocoris strobicola @ NCSU_ENT (4)

Phytocoris stellatus @ AMNH_ENT (20)

Pilophorus americanus @ AMNH_PBI (1)

Psallovius flaviclavus @ AMNH_PBI (8)

Psallovius piceicola @ AMNH_PBI (1)
Polyporaceae  Polyporus anceps @ BPI (1)
Rhytismataceae  Hypodermella arcuata @ BPI (1)

Hypodermella sulcigena @ BPI (1)
_  Diplozythia @ BPI (1)

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6. Pinus strobiformis Engelmann in Wislizenus, Mem. Tour N. Mexico. 102. 1848.

Southwestern white pine, Mexican white pine, pino enano

Pinus ayacahuite Ehrenberg var. brachyptera G.R. Shaw; P . ayacahuite var. reflexa (Engelmann) Voss; P . ayacahuite var. strobiformis (Engelmann) Lemmon; P . flexilis E.James var. reflexa Engelmann; P . reflexa (Engelmann) Engelmann

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. 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. 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. Pollen cones cylindric, ca. 6--10mm, pale yellow-brown. Seed 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. Seeds ovoid; body 10--13mm, red-brown, essentially wingless. 2 n =24.

Arid to moist summit elevations, montane forests; 1900--3000m; Ariz., N.Mex., Tex.; n Mexico.

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.

Updated: 2024-05-18 19:34:44 gmt
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