Pinus cembroides
Pinus engelmannii
Mexican pinyon, pino piñonero, piñón
Apache pine, Arizona longleaf pine, pino real
red-brown to dark brown, shallowly and irregularly furrowed, ridges broad, scaly.
dark brown, at maturity deeply furrowed, ridges becoming yellowish, of narrow, elongate, scaly plates.
spreading-ascending;
twigs red-brown, sometimes finely papillate, aging gray to gray-brown.
straight to ascending;
twigs stout (1–2cm thick), pale gray-brown, aging darker brown, rough.
ovoid to short cylindric, pale red-brown, 0.5–1.2cm, slightly resinous.
ovoid-conic, to 2cm, resinous;
scale margins pale fringed.
(2–)3(–4) per fascicle, spreading to upcurved, persisting 3–4 years, 2–6cm × 0.6–0.9(–1)mm, connivent, 2–3-sided, blue- to gray-green, abaxial surface not conspicuously whitened with stomatal bands or if stomatal bands present, these less conspicuous than on adaxial surfaces, often with 2 subepidermal resin bands evident, adaxial surfaces conspicuously whitened with stomatal lines, margins entire to finely serrulate, apex narrowly conic or subulate;
sheath 0.5–0.7cm, scales soon recurved, forming rosette, shed early.
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.
ellipsoid, to 10mm, yellow.
cylindric, ca. 25mm, yellow to yellow-brown.
cones maturing in 2 years, shedding seeds and falling soon thereafter, spreading, symmetric, ovoid before opening, broadly depressed-ovoid to nearly globose when open, 1–3.5cm, pale yellow- to pale red-brown, resinous, nearly sessile or short-stalked;
apophyses thickened, slightly domed, angulate, transversely keeled;
umbo subcentral, slightly raised to depressed, truncate or umbilicate.
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.
=24.
=24.
Pinus cembroides
Pinus engelmannii
Pinus cembroides is the common pinyon of Mexican commerce. Populations of the Edwards Plateau, Texas, are disjunct about 150km east and north of the main area of distribution of the species, and they have been described as a distinct variety, P. cembroides var. remota Little, on the basis of thin seed shell and a higher frequency of 2-leaved fascicles in contrast to the thicker seed shell and prevalently 3-leaved fascicles in Mexican pinyon populations to the west and south. The strong overlap in nearly all character states between the populations of the Edwards Plateau and other populations makes var. remota difficult to maintain.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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