Flora of North America species comparison

trigonous, 10–50 cm × 1–3 mm.

trigonous, (15–) 20–40(–65) cm × 0.5–1 mm, glabrous.

flat to V-shaped, 10–40 cm × 2–5 mm.

V-shaped, (10–)20–40 cm × 0.8–2.8(–3) mm, glabrous.

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.

spike 1, densely oblong-cylindric, (15–)25–35(–40) × 12–18(–22) mm, (spikelets loosely spaced, 7–9 per 5 mm of rachis);

rays (5–)6–8(–11), 0.5–4(–7.5) cm;

bracts (4–)5–7(–8), ascending at 30º, (4–)10–30(–35) cm × (1–)2–4(–7) mm;

rachilla deciduous, wings persistent, 0.4–0.5 mm wide.

(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.

(20–)40–80(–100), linear, ± cylindric, scarcely compressed, (4.5–)6–9(–11) × (0.5–) 0.6–0.7(–1) mm;

floral scales persistent, (1–)2–3(–4), appressed, medially green, laterally light brown to tawny or bronze, medially (1–)3-ribbed, laterally 3-ribbed, oblong, (2.6–)2.8–3.2(–3.4) × (1–)1.2(–1.4) mm, apex acute, mucronulate, mucro to 0.1(–0.2) mm.

stamens 3;

anthers 1–1.3 mm;

styles 0.6 mm;

stigmas 1.5 mm.

anthers 0.6–0.8 mm;

styles (0.4–)0.6–1(–1.2) mm;

stigmas persistent on achenes, prominently exserted from floral scales, (1.5–)2–3(–4) mm.

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

brown to reddish brown, stipitate, narrowly oblong, 1.8–2.1 × (0.4–)0.5(–0.7) mm, stipe 0.1–0.2 × 0.1–0.2 mm, apex apiculate, acute, surfaces puncticulate.