Flora of North America species comparison

yellow- to red-brown, deeply irregularly furrowed, cross-checked into broadly rectangular, scaly plates.

gray, deeply V-furrowed, furrow bases red, ridges irregularly elongate-rectangular, their flattened surfaces scaly.

descending to spreading-ascending;

twigs stout (to 2cm thick), orange-brown, aging darker orange-brown, rough.

level to downcurved or ascending, poorly self-pruning;

twigs slender, red-brown, sometimes glaucous, aging gray, rough.

ovoid, to 2cm, fully 1cm broad, red-brown, very resinous;

scale margins white-fringed.

ovoid to ovoid-cylindric, red-brown, ca. 1.5cm, resinous.

2–5 per fascicle, spreading to erect, persisting (2–)4–6(–7) years, 7–25(–30)cm × (1–)1.2–2mm, slightly twisted, tufted at twig tips, pliant, deep yellow-green, all surfaces with evident stomatal lines, margins serrulate, apex abruptly to narrowly acute or acuminate;

sheath 1.5–3cm, base persistent.

(2–)3 in a fascicle, spreading-ascending, persisting 3–4 years, (8–)9–15(–20)cm × 1.3–1.8(–2)mm, straight, slightly twisted, deep yellow-green, all surfaces with fine stomatal lines, margins serrulate, apex conic-subulate;

sheath (1–)1.5–2cm, base persistent.

ellipsoid-cylindric, 1.5–3.5cm, yellow or red.

ellipsoid-cylindric, 10–15mm, orange-brown.

cones maturing in 2 years, shedding seeds soon thereafter, leaving rosettes of scales on branchlets, solitary or rarely in pairs, spreading to reflexed, symmetric to slightly asymmetric, conic-ovoid before opening, broadly ovoid when open, 5–15cm, mostly reddish brown, sessile to nearly sessile, scales in steep spirals (as compared to Pinus jeffreyi) of 5–7 per row as viewed from side, those of cones just prior to and after cone fall spreading and reflexed, thus well separate from adjacent scales;

apophyses dull to lustrous, thickened and variously raised and transversely keeled;

umbo central, usually pyramidal to truncated, rarely depressed, merely acute, or with a very short apiculus, or with a stout-based spur or prickle.

cones maturing in 2 years, shedding seeds soon thereafter, but often serotinous and persistent 6–20 years, solitary to whorled, spreading to recurved, curved, very asymmetric, ovoid before opening, broadly ovoid when open, 7–14cm, pale red-brown and lustrous, scales rigid, stalks to 1cm;

apophyses toward outer cone base increasingly mammillate, those on inward cone side and middle and apex of cone more level;

umbo central, mostly depressed, with small central boss or occasionally with slender, deciduous prickle.

=24.