Flora of North America species comparison

trigonous, 30–150 cm × 1–5(–8) mm.

not basally cormlike, trigonous, (15–)30–100 cm × 1–3 mm, glabrous.

bladeless.

V-shaped, 10–65 cm × 2–4 mm.

heads digitate, 15–30(–36) mm diam.;

rays (14–)20–22, (2–)5–12(–20) cm; 2d order rays 0.3–3(–4) cm; 3d order rays sometimes present, 0.3–2.5 cm;

bracts (4–)18–22, ± horizontal, flat, 15–27 cm × (1.5–)8–12 mm.

spikes densely ovoid to cylindric, 8–17 mm wide;

rays 1–6, 2–10 cm, glabrous;

rachis 4–8 mm;

bracts 3–9, ± horizontal, flat, 4–20 cm × 2–4 mm;

rachilla persistent, wings deciduous, 0.2(–0.3) mm wide.

8–20, ovoid to linear-lanceoloid, compressed, 5–25 × 1.5–2 mm;

floral scales 8–28, laterally whitish or light brown, ± hyaline, medially light brown, laterally ribless, medially 3-ribbed, 2-keeled in proximal 30–60%, deltate-ovate, 1.6–2.4 × (1–)1.2–1.5(–1.7) mm, apex acute.

30–80, oblong-lanceoloid, ± terete-quadrangular, 4–7 × 1.5–2 mm;

distal spikelet spreading or ascending;

floral scales persistent, 4–6, appressed, stramineous, laterally 3-ribbed, oblong-elliptic, 1.9–2.6 × 1.1–1.5 mm.

stamens 3;

anthers 0.7–1 mm;

styles 0.5–1 mm;

stigmas 0.6–1 mm.

anthers 0.3–0.5 mm;

styles 0.5 mm;

stigmas 1–2 mm.

brown, sessile or stipitate, broadly ellipsoid, 0.6–0.8 × 0.4–0.6 mm, stipe if present to 0.1 mm, apex obtuse, apiculate, surfaces puncticulate.

brown, ± stipitate, oblong-fusiform, 1.2–1.5 × 0.4–0.6 mm, apex ± acute, surfaces puncticulate.