Pinus strobiformis
Pinus clausa
Chihuahua white pine, Mexican white pine, pino enano, Southwestern white pine
sand pine, scrub pine, spruce pine
gray, aging red-brown, furrowed, with narrow, irregular, scaly ridges.
gray to gray-brown, furrowed, with narrow, flat, irregular ridges, resin pockets absent, on upper sections of the trunk reddish to red-brown, platy becoming smooth distally.
spreading-ascending;
twigs slender, pale red-brown, puberulous or glabrous, sometimes glaucous, aging gray or gray-brown, smooth.
spreading to ascending, poorly self-pruning;
twigs slender, violet- to red-brown, rarely glaucous, aging gray, smooth.
ellipsoid, red-brown, ca. 1cm, resinous.
cylindric, purple-brown, to 1cm;
scale margins white-fringed.
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-ascending, persisting 2–3 years, (3–)6–9(–10)cm × ca. 1mm, straight, slightly twisted, dark green, all surfaces with fine, inconspicuous stomatal lines, margins finely serrulate, apex short-conic;
sheath 0.3–0.5(–0.7)cm, base persistent.
cylindric, ca. 6–10mm, pale yellow-brown.
ellipsoid, ca. 10mm, brownish yellow.
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 or often long-serotinous, long-persistent, solitary or whorled, spreading, symmetric (rarely slightly asymmetric, reflexed), lanceoloid before opening, ovoid to broadly ovoid when open, 3–8cm, red-brown, sessile or on stalks to 1cm, scales with dark red-brown, purple, or purple-gray border distally on adaxial surface;
apophyses thickened, shallowly and angulately raised, transversely rhombic, cross-keeled;
umbo central, low-pyramidal, tapering to sharp tip or weak, often deciduous prickle.
=24.
=24.
Pinus strobiformis
Pinus clausa
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.)
Although Pinus clausa is too profusely branched to be important for saw timber, it is managed to produce a high volume of pulpwood in northern peninsular Florida.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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