Flora of North America species comparison

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.

spreading to recurved, 70–100(–200) × 7–10 cm;

blade green, without bud-prints, linear-lanceolate, rigid, adaxially concave toward apex, abaxially convex toward base;

margins slightly wavy, armed, teeth single, 2–3 mm, 1–2 cm apart, often with some interstitial smaller teeth;

apical spine dark brown, conical, 1–2 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.

3–5 m. Inflorescences paniculate, often bulbiferous;

bracts caducous;

lateral branches 10–18, ascending, comprising distal 1/2 of inflorescence, longer than 4 cm.

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.

15 or more per cluster, erect, 6–8 cm;

perianth greenish yellow, tube funnelform, 11–13 × 4–6 mm, limb lobes incurved, drying reflexed on tube, subequal, 18–22 mm;

stamens long-exserted;

filaments inserted on 2 levels at or slightly above mid perianth tube, erect, yellow, 4–5 cm;

anthers yellow, 22–25 mm;

ovary 4–5 cm, neck absent.

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

short-pedicellate, ellipsoid to oblong, 3.5–5 cm, apex beaked.

2–4 mm.

not seen.

= 120, 150, 160, 180, 190.