Flora of North America species comparison

trigonous, 8–50 cm × 1–3 mm.

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

flat or V-shaped, 10–40 cm × 2–5 mm.

flat, 10–35 cm × 3–10 mm.

heads digitate, 8–18 mm diam.;

rays 4–9, 1–8 cm; 2d order rays 0.5–2 cm;

bracts 3–5, ± horizontal, flat, 1–20 cm × 1–4 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.

commonly proliferous, 2–6, linear to oblong, compressed, 3–24 × 2–2.5 mm;

floral scales 3–20(–50), reddish brown, laterally 1–3-ribbed, ovate, 2–2.5 × 1.5–2 mm.

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.

stamens 3;

anthers 1.5 mm;

styles 1 mm;

stigmas 1.5 mm.

anthers 0.4 mm;

styles 0.6 mm;

stigmas 1 mm.

reddish brown, sessile, obovoid, 0.8–1 × 0.4–0.5 mm, apex obtuse, scarcely apiculate, surfaces glabrous.

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