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.

ascending to arching or reflexed, 100–150 × 15–25 cm;

blade light green, probably not cross-zoned, broadly lanceolate, firm, adaxially plane, abaxially slightly convex;

margins nearly straight, not fibrous, minutely armed near base, teeth single prickles, 1–2 mm, 2–3+ cm apart;

apical spine dark brown, acicular, 2.5 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.

8–10(–13) m. Inflorescences paniculate, open, often bulbiferous;

bracts persistent, triangular, 0.5–2 cm;

lateral branches 12–20, slightly ascending, comprising distal 1/3–1/2 of inflorescence, longer than 10 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.

12–22 per cluster, erect, 5.5–6 cm;

perianth greenish yellow, tube urceolate, 8–10 × 4–7 mm, limb lobes erect, equal, 20–30 mm;

stamens long-exserted;

filaments inserted ca. mid perianth tube or above, erect, yellow, 4–5 cm;

anthers yellow, 20–25 mm;

ovary 2–3 cm, neck slightly constricted.

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

oblong to ovoid, 3 cm.

2–4 mm.

5–6 mm.