Flora of North America species comparison

erect, spreading to ascending, occasionally reflexed, 80–200 × 15–25 cm;

blade light green to green or glaucous-gray, sometimes variegated or cross-zoned, narrowly to broadly lanceolate, smooth, rigid;

margins nearly straight or undulate to crenate, armed, teeth single, 5–10 mm, 1–4 cm apart;

apical spine dark brown to grayish, conical or subulate, 2–6 cm.

ascending, 12–50 × 1–5.5 cm;

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

margins straight or undulate, nonfiliferous, conspicuously armed, horny from distalmost teeth to apical spine, teeth single, 2–12(–15) mm, 1–4 cm apart, rarely absent;

apical spine light gray to ivory white, acicular or subulate, 2–20 cm.

5–9 m. Inflorescences paniculate, not bulbiferous;

bracts persistent, triangular, 5–15 cm;

lateral branches 15–35, horizontal to slightly ascending, comprising distal 1/3–1/2 of inflorescence, longer than 10 cm.

1.7–5 m. Inflorescences spicate, racemose or narrowly paniculate, open to densely flowered;

bracts caducous, narrowly triangular, 4–8 cm;

lateral branches 50+, horizontal to slightly ascending, comprising distal 1/2–2/3 of inflorescence, shorter than 10 cm.

erect, 7–10.5 cm;

perianth yellow, tube funnelform to cylindric, 8–20 × 12–20 mm, limb lobes erect, subequal, 20–35 mm;

stamens long-exserted;

filaments inserted above mid perianth tube, erect, yellow, 6–9 cm;

anthers yellow, 25–35 mm;

ovary 3–4.5 cm, neck constricted, 3–6(–8) mm.

2–12 per cluster, erect, urceolate, 2.3–4.3 cm;

perianth yellow, tube campanulate, 1–4 × 6.5–11.5 mm, limb lobes connivent, erect, subequal, 7–12 mm;

stamens slightly exserted;

filaments inserted at or 1–3 mm above base of perianth tube, erect, white, 1.3–2.4 cm;

anthers pale yellow, 5–12 mm;

ovary 1.2–2.9 cm, neck constricted, 3.5–8.5(–10) mm.

short-pedicellate, oblong, 3.5–8 cm, apex beaked.

pedicellate, oblong to ovoid, 1–2.5 cm, apex beaked.

6–8 mm.

2–4 mm.