Flora of North America species comparison

trigonous, (10–)30–80(–140) cm × (0.4–)1–3(–5) mm, glabrous.

trigonous, 10–50 cm × 1–3 mm.

V-shaped or flanged V-shaped, (5–)15–70(–90) cm × (2–)4–10(–13) mm, glabrous.

flat to V-shaped, 10–40 cm × 2–5 mm.

spikes 1(–5), rather densely ovoid or oblong-cylindric, (10–)25–45(–62) × 7–22 mm, 11–21 spikelets per 5 mm of rachis;

rays (3–)5–10(–17), (1–)5–12(–24) cm;

bracts (2–)4–8, ascending at 30–45°, V- or inversely W-shaped, (2–)8–40(–65) cm × (1–)2–8 mm;

rachilla deciduous, wings 0.4–0.5 mm wide.

heads digitate, 10–40 mm diam.;

rays 5–12, 1–12 cm; 2d order rays 1–3 cm;

bracts 3–5, horizontal, flat to V-shaped, 1–15 cm × 1–2 mm.

(10–)50–150, oblong to linear, quadrangular, (3–)4–8(–18) × (0.8–)1–1.2(–1.6) mm;

distal spikelet spreading or ascending;

floral scales (1–) 3–8, pale greenish white to golden brown, deep brown, or reddish brown, medially usually green, weakly to strongly 3(–4)-ribbed laterally, 1–3-ribbed medially, ovate to elliptic, (2–)2.6–3.2(–4) × 1.2–2 mm, apex obtuse.

(1–)2–4(–6), oblong to linear, compressed, 5–25 × 2.8–3.6 mm;

floral scales 20–60, stramineous or reddish green, laterally weakly 3-ribbed, ovate-elliptic, 2.5–3 × 1–1.8 mm.

anthers (0.4–)0.6–1 mm;

styles 0.4–1.6 mm;

stigmas 1–1.5 mm.

stamens 3;

anthers 1–1.3 mm;

styles 0.6 mm;

stigmas 1.5 mm.

brown or reddish brown, sessile or nearly so, ellipsoid, 1.4–1.8(–2) × 0.6–0.8(–1) mm, apex acute to obtuse, slightly apiculate, surfaces puncticulate.

reddish brown, sessile, ovoid, 0.7–0.8 × 0.4–0.5 mm, apex obtuse, apiculate or not, surfaces glabrous.