Flora of North America species comparison

mostly ascending to erect, (25–)30–50 × 2–4(–5.2) cm;

blade light green to yellowish green, sometimes checkmarked but without bud-prints, linear-lanceolate, stiff, adaxially concave toward apex, abaxially convex toward base;

margins straight, easily detached, nonfiliferous, conspicuously armed, teeth single 2–6 mm, mostly (1–)2–4 cm apart, rarely absent;

apical spine grayish, conical to subulate, 1.5–4.5 cm.

mostly erect, 30–40(–70) × 3–4.5(–5) cm;

blade light green to yellowish green, without bud-prints, linear-lanceolate, stiff, adaxially plane to concave toward apex, abaxially convex toward base;

margins undulate to crenate, nonfiliferous, not easily detached, conspicuously armed, teeth single or occasionally double, 4–6(–8) mm, 1–2 cm apart;

apical spine reddish to grayish, subulate, 1–1.5(–2) cm.

(2–)2.5–3.5 m. Inflorescences spicate, densely flowered on distal 1/2;

bracts caducous, linear, 1–3 cm;

peduncle 2–5 mm, rarely 20–150 mm.

3–4.5(–5) m. Inflorescences spicate, densely flowered on distal 1/2;

bracts caducous, acicular, 3–5 cm;

peduncle 4 cm or shorter.

2–3 per cluster, erect to slightly recurved, (2.4–)3–4.5 cm;

perianth yellow, frequently tinged with red or purple, tube campanulate, 1.5–4 × 6–12 mm, limb lobes ascending, subequal, 11–20 mm;

stamens long-exserted;

filaments inserted on rim of perianth tube, spreading, yellow to reddish, 2.5–4.2 cm;

anthers pale yellow, (11–)15–20 mm;

ovary (0.8–)1.5–2.2 cm, neck constricted (2–)4–8.5 mm.

1 on short pedicel, or 2–7 per cluster, erect, 3.5–4(–4.5) cm;

perianth greenish white to yellowish green, tube campanulate, 2–4 × 8–10 mm, limb lobes erect to slightly spreading, subequal, 14–20 mm;

stamens long-exserted;

filaments inserted on rim of perianth tube, spreading, greenish or lavender, 3–4.5 cm;

anthers pale yellow, 15–20 mm;

ovary 1.8–2.2 cm, neck constricted 5–7 mm.

sessile or short-pedicellate, oblong, 1.8–2.5(–3) cm, apex beaked.

sessile or short-pedicellate, oblong and 1.8–2.5 cm or globose and 1.5–2 cm, apex beaked.

4.5–6 mm.

5–6 mm.

= 110–120.

= 60.