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Chihuahua white pine, Mexican white pine, pino enano, Southwestern white pine

bottom white pine, cedar pine, spruce pine, Walter pine

Habit Trees to 30m; trunk to 0.9m diam., slender, straight; crown conic, becoming rounded to irregular. Trees to 30m; trunk to 1m diam., straight; crown conic to rounded.
Bark

gray, aging red-brown, furrowed, with narrow, irregular, scaly ridges.

gray, fissured and cross-checked into elongate, irregular, scaly plates, resin pockets absent, on upper sections of trunk ± smooth, gray, looking slick.

Branches

spreading-ascending;

twigs slender, pale red-brown, puberulous or glabrous, sometimes glaucous, aging gray or gray-brown, smooth.

whorled, spreading to ascending;

twigs slender, purple-red to red-brown, occasionally glaucous, aging gray, smooth.

Buds

ellipsoid, red-brown, ca. 1cm, resinous.

ovoid to ovoid-cylindric, red-brown, ca. 0.5–1cm, slightly resinous;

scale margins finely fringed.

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.

2 per fascicle, spreading to ascending, persisting 2–3 years, 4–8(–10)cm × 0.7–1.2mm, straight, slightly twisted, dark green, all surfaces with fine stomatal lines, margins finely serrulate, apex sharply conic;

sheath 0.5–1cm, base persistent.

Pollen cones

cylindric, ca. 6–10mm, pale yellow-brown.

lance-cylindric, 10–15mm, purple-brown.

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.

cones maturing in 2 years, shedding seeds soon thereafter, semipersistent, spreading to recurved, nearly symmetric, lance-ovoid before opening, ovoid-cylindric when open, 3.5–7cm, red-brown, aging gray, nearly sessile or on stalks to 1cm, scales lacking contrasting border on adaxial surfaces (as in P. echinata);

apophyses but slightly thickened and raised;

umbo central, depressed, unarmed or with small, curved, weak, deciduous, short-incurved prickle.

2n

=24.

=24.

Pinus strobiformis

Pinus glabra

Habitat Arid to moist summit elevations, montane forests Sandy alluvium and mesic woodland
Elevation 1900–3000m (6200–9800ft) 0–150m (0–500ft)
Distribution
from FNA
AZ; NM; TX; n Mexico
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[BONAP county map]
from FNA
AL; FL; GA; LA; MS; SC
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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.)

Pinus glabra is more shade tolerant than most yellow pines. Although the trees grow large, the wood is not much valued. The species is similar in tree form to P. strobus. It resembles P. echinata in shoot and leaf but has less prickly cones and deeper green leaves.

(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
P. albicaulis, P. aristata, P. attenuata, P. balfouriana, P. banksiana, P. cembroides, P. clausa, P. contorta, P. coulteri, P. echinata, P. edulis, P. elliottii, P. engelmannii, P. flexilis, P. glabra, P. jeffreyi, P. lambertiana, P. leiophylla, P. longaeva, P. monophylla, P. monticola, P. muricata, P. palustris, P. ponderosa, P. pungens, P. quadrifolia, P. radiata, P. resinosa, P. rigida, P. sabiniana, P. serotina, P. strobus, P. sylvestris, P. taeda, P. torreyana, P. virginiana, P. washoensis
P. albicaulis, P. aristata, P. attenuata, P. balfouriana, P. banksiana, P. cembroides, P. clausa, P. contorta, P. coulteri, P. echinata, P. edulis, P. elliottii, P. engelmannii, P. flexilis, P. jeffreyi, P. lambertiana, P. leiophylla, P. longaeva, P. monophylla, P. monticola, P. muricata, P. palustris, P. ponderosa, P. pungens, P. quadrifolia, P. radiata, P. resinosa, P. rigida, P. sabiniana, P. serotina, P. strobiformis, P. strobus, P. sylvestris, P. taeda, P. torreyana, P. virginiana, P. washoensis
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) Walter: Fl. Carol. 237. (1788)
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