Flora of North America species comparison

to 100 cm × (0.8–)1–1.2 mm distally.

blades flat, tip trigonous, channeled in cross section, to 40 cm × 1.5–6(–8) mm;

distal leaf blade much longer than sheath.

blade-bearing involucral bracts 1–3, proximally blade, often sheath black, leaflike, longest 1–12 cm.

(1–)2–10, in subumbels, patent or pendent, ovoid, 10–20 mm in flower, 20–50 mm in fruit;

peduncles 5–60 mm, smooth or scabrous;

scales lanceolate or ovate, 5–10 mm, with prominent midrib fading proximal to tip, apex ± acute;

proximal scales without lateral ribs.

perianth bristles 10 or more, white or pale yellow brown, 15–30 mm, smooth;

anthers 2–5 mm.

black, oblanceoloid, 2–5 mm.