Flora of North America species comparison

rough, furrowed, fibrous.

rough, furrowed, fibrous.

comblike, 0.5–1 mm diam.

decussate, (1.5–)2–2.5 mm diam.

with conspicuous, pitlike, abaxial gland that produces drop of resin, sometimes glaucous.

usually with inconspicuous, shallow, pitlike, abaxial gland that usually does not produce drop of resin, often glaucous.

2–3 × 2 mm;

pollen sacs 3–5.

mostly 3–4 × 2 mm;

pollen sacs 3–4.

cones globose, mostly 1.5–2.5 cm, brown or gray, not glaucous;

scales 3–4 pairs, smooth except for erect conic umbos, 2–4 mm.

cones usually globose, mostly 2–2.5 cm, brown or gray, not glaucous;

scales mostly 3–4 pairs, with scattered resin blisters, umbos inconspicuous or to 4 mm.

trees to 12 m;

crown broadly conical, dense.