Flora of North America species comparison

stoutly trigonous, thickened, 50–300 cm × 5–30 mm, basally indurate, glabrous.

roundly trigonous, 80–120 cm × 3–6 mm, glabrous.

V-shaped, with cross ribs, 40–130 cm × 10–15 mm, margins and keel scabrid.

5–12, V-shaped, 30–75 cm × 8–14 mm, septate, leathery, margins harshly scabrid.

spikes appressed-ascending, narrowly cylindric, (2–)3–45 mm × (4–)7–10 mm;

rays (5–)9–12, 2–22(–30) cm; 2d order rays distinctly flattened, 1–10 cm; 3d order rays flattened, 0.5–3 cm;

rachis 2.5–4 cm;

bracts (6–)9–10, ascending at 45–75°, V- or inversely W-shaped, (5–)15–90 cm × 0.5–20 mm;

rachilla persistent, wings 0.2–0.4 mm wide.

spikes 1–4 per ray, loosely ovoid to broadly ellipsoid, 12–20 × 8–12 mm;

rays 6–9, 3–10(–12) cm; 2d order rays 1–4, 1–2 cm;

rachis 4–12 mm;

bracts 5–10, horizontal to ascending at 30°, 15–40 cm × 4–8(–11) mm;

rachilla deciduous, wings persistent, hyaline, fragile, 0.3 mm wide, covering less than 1/2 of achene.

(4–)10–35, appressed-ascending, compressed, linear, 7–12(–15) × 0.6–1.2 mm;

floral scales deciduous, 6–20, marginally clear, laterally brown, medially green, laterally 2–3-ribbed, medially 1-ribbed, oblong-ovate, (3.2–) 3.8–4.3 × 1.2–1.7 mm, apex spreading, acute to obtuse, mucronulate.

40–80, narrowly ellipsoid to ellipsoid, roughly quadrangular to weakly flattened, 5–8 × 1.2–1.5 mm;

distal spikelet spreading or ascending;

floral scales (1–)2(–3), ascending, brick red, medially greenish, laterally 3–4-ribbed, medially 1–3-ribbed, green, ovate, 2.2–3.5 × 1.5–1.8 mm, apex subacute.

anthers 0.7–0.9 mm, connective apex bright red, oblong, to 0.1 mm;

styles 0.8–1.3 mm;

stigmas 2–3.3 mm.

anthers (0.7–)1–1.5 mm, filaments 4–4.7 mm;

styles 0.5–0.9 mm;

stigmas 2–3 mm.

brown, sessile, narrowly ellipsoid, 1.8–2.5 × 0.8–1.3 mm, apex ± acute, not apiculate, surfaces puncticulate.

brown, ellipsoid to oblong-fusiform, 1.7–1.8 × 0.7 mm, base cuneate, apex subacute and apiculate, surfaces finely puncticulate to glabrous.