Flora of North America species comparison

to 100 cm × (0.8–)1–1.2 mm distally.

5–20(–50) cm, smooth or rough distally.

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

distal leaf blade much longer than sheath.

cauline leaves 0–1, distal leaf usually proximal to mid culm, bladeless or with short blade;

blade forming angle with sheath, filiform or trigonous-channeled, 0.4–1.2 mm wide.

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

involucral bracts absent or present as short blade on distal leaf.

(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.

solitary, erect, globose in fruit, 10–20 mm in flower, 15–30 mm in fruit;

scales pale blackish brown, margins and tip hyaline, ovate-lanceolate, thin;

proximal empty scales mostly 10–15, appressed to ascending, ovate, 5–8 mm, ribs ± to margins, midrib not reaching tip, apex acute.

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

anthers 2–5 mm.

perianth bristles white to very pale brown;

anthers 0.6–1.2 mm.

black, oblanceoloid, 2–5 mm.

ellipsoid-obovoid, 1.8–2.1 mm.

= 60.