Pinus engelmannii
Pinus glabra
Apache pine, Arizona longleaf pine, pino real
bottom white pine, cedar pine, spruce pine, Walter pine
dark brown, at maturity deeply furrowed, ridges becoming yellowish, of narrow, elongate, scaly plates.
gray, fissured and cross-checked into elongate, irregular, scaly plates, resin pockets absent, on upper sections of trunk ± smooth, gray, looking slick.
straight to ascending;
twigs stout (1–2cm thick), pale gray-brown, aging darker brown, rough.
whorled, spreading to ascending;
twigs slender, purple-red to red-brown, occasionally glaucous, aging gray, smooth.
ovoid-conic, to 2cm, resinous;
scale margins pale fringed.
ovoid to ovoid-cylindric, red-brown, ca. 0.5–1cm, slightly resinous;
scale margins finely fringed.
3(–5) per fascicle, spreading-ascending, often drooping, forming a brush at twig tips, persisting 2 years, (20–)25–45cm × 2mm, dull green, all surfaces with fine stomatal lines, margins coarsely serrulate, apex conic-subulate;
sheath 3–4cm, base persistent.
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.
cylindric, ca. 25mm, yellow to yellow-brown.
lance-cylindric, 10–15mm, purple-brown.
cones maturing in 2 years and shedding seeds soon thereafter, not persistent, terminal, sometimes curved, often asymmetric, lance-ovoid before opening, ovoid when open, 11–14cm, light dull brown, nearly sessile or short-stalked;
apophyses rhombic, somewhat to quite elongate, strongly raised toward outer cone base, sometimes curved, strongly cross-keeled, narrowed to thick, curved, broadly triangular-based umbo, this often producing outcurved claw.
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.
=24.
=24.
Pinus engelmannii
Pinus glabra
In general appearance Pinus engelmannii much resembles P. palustris with its short-persistent, long leaves (but in this species drooping) and in its tendency to form a grass stage. It has a deep taproot as do P. palustris and P. ponderosa.
(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.)
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