Flora of North America species comparison

roundly trigonous, 10–50 cm × 0.9–2.4 mm.

roundly trigonous, (10–)20–30(–45) cm × 0.4–1.2 mm, distal 1/2 glabrous or infrequently scabridulous.

adaxial face concave, becoming flat to trigonous apically, 10–46 cm × 1.5–4 mm, margins involute.

2–6(–8), V-shaped or flat, 8–12(–16) cm × 1–2(–4) mm.

spikes ovoid, 1–5.5 cm wide;

rays usually 3–6, 0.5–5 cm, glabrous;

sometimes absent in small plants;

if absent, inflorescence a congested head of spikelets 1–3.5 cm diam.; 2d order rays 0–3, 1–3 cm;

bracts 3–5, vertical to ascending at 45°, 2.5–25 cm × 1.2–4 mm, margins involute; 2d order bracts 0–2, 5–20 mm;

rachilla persistent, wingless.

heads hemispheric, 7–12(–15) mm diam.;

rays 1–3(–5), 0.5–2 cm;

bracts 3–6, longest erect to ascending, flat to V-shaped, (1.5–)3–12(–25) cm × 1–2.5(–3.5) mm.

5–24, greenish yellow to golden brown, oblong to linear-lanceoloid, quadrangular, strongly compressed, 7–20(–30) × 2.5–4(–6) mm;

floral scales 10–20(–40), spreading, pale green to stramineous, laterally 2–3-ribbed, ovate-lanceolate, 3.1–4 × 1.5–2.4 mm, apex with mucro 0.2–0.8 mm.

(15–)25–50(–75), ovoid, compressed, 4–7 × 2–3 mm;

floral scales 8–20(–35), laterally yellowish, yellowish green, or light reddish brown, medially light brown or greenish brown, 2-keeled, subtly 1-ribbed, ovate-lanceolate, 1–2 × 1–1.4 mm, apex acute, mucronate, straight to excurved, glabrous or sparsely scabridulous.

anthers 0.6–0.8 mm;

styles 0.8–1.6 mm;

stigmas 1–1.4 mm.

stamen 1;

anthers 0.5 mm;

styles 0.8–1.1 mm;

stigmas 0.5 mm.

light to dark brown, rarely somewhat reddish, stipitate, ellipsoid, 2–2.4 × 0.5–0.8 mm, base cuneate, stipe whitish, spongy, 0.2–0.3 × 0.2–0.4 mm, apex acute, persistent style forming beak 0.5–1.2 mm, surfaces glabrous or finely papillose.

brown, stipitate, broadly ellipsoid, abruptly contracted to base, 0.8–1.1 × 0.3–0.4 mm, stipe 0.1 mm, apex acute, tapering to slender beak formed of persistent style base, surfaces papillose.