Flora of North America species comparison

roundly trigonous to terete, 30–80 cm × 1–1.6 mm, glabrous.

trigonous, 25–90 cm × 2 mm, hispidulous or glabrous on angles distally.

1–6, 10–40 cm, glabrous or essentially so.

flat, 10–35 cm × 3–10 mm.

heads ovoid to pyramidal, 9–15 mm diam.;

rays 0 or 3–6, 0.5–4 cm, glabrous;

bracts 3–4, longest erect, appearing as continuation of culm, others horizontal to ascending, 4–17 cm × 1.5–4 mm.

spikes 1–4(–6), loosely oblong-ovoid, 2–3 × 1–2 cm;

rays 3–10, 1–16 cm; 2d order rays to 3 cm;

rachis hispidulous, prickles slender, 0.1–0.2 mm;

bracts 3–5, ± ascending, flat, 5–35 cm × 0.5–5(–7) mm;

rachilla persistent, wingless.

25–60, reddish with contrasting yellowish or greenish edges, oblong-lanceoloid, strongly compressed, 5–6(–15) × 1.5–2.5 mm;

floral scales 10–22, laterally reddish, medially yellowish green, 2-keeled, laterally strongly 1-ribbed on each side, proximally grooved, ovate-elliptic, 1.4–2.2 × 0.8–1.5 mm, apex acute, apically scabridulous (sometimes glabrous).

15–40, linear-lanceoloid, compressed, 6–12 × 1.5–2 mm;

floral scales deciduous, 8–16, light brown with clear border, laterally 2–3-ribbed, ovate, 1.8–2 × 1.2–1.6 mm;

apex entire, emarginate, or mucronulate, mucro at most 0.3 mm.

stamen 1;

anthers 0.6–1 mm;

styles 0.3–0.5 mm;

stigmas 0.3–0.6 mm.

anthers 0.4 mm;

styles 0.6 mm;

stigmas 1 mm.

reddish brown, stipitate, ovoid-ellipsoid, 0.8–0.9 × 0.3–0.4 mm, stipe 0.1–0.2 mm, apex acute to acuminate, surfaces reticulate or subtly rugulose.

brown, sessile, broadly ellipsoid, 1–1.2 × 0.5 mm, apex obtuse, apiculate, surfaces puncticulate.