Flora of North America species comparison

basally cormlike, obtusely trigonous to subterete, 25–100 cm × 2–4 mm, densely minutely scabridulous.

trigonous, 7–30 cm × 0.5–1 mm, glabrous.

inversely W-shaped, 20–70 cm × 4–7 mm, adaxial surface densely hirtellous.

V-shaped to flat, 5–20 cm × 1–2.5 mm.

spikes turbinate, 10–12 × 6–9 mm, ± as long as wide;

rays 6–12, 1–30 cm (longest bract equaling or shorter than longest ray), harshly scabrid;

bracts 3–10, horizontal to ascending at 30°, inversely W-shaped, 6–27 cm × 3–6 mm;

rachilla persistent, wings hyaline, 0.5 mm wide, covering 1/2 of mature achene.

spike hemispheric, 7–20 mm wide;

rays absent;

rachis 1–3 mm;

bracts 2–3, reflexed, flat, 5–12 cm × 1–2 mm;

rachilla deciduous, wings 0.2 mm wide.

30–60, proximal spikelets reflexed nearly parallel to ray, distal ones spreading, linear, ± terete, 6–8 × 1–1.4 mm;

floral scales persistent, 1(–2), appressed, stramineous, often suffused with reddish purple, laterally 4–6-ribbed, ovate-lanceolate, 4–4.5 × 1.4–1.6 mm, apex straight, excurved mucronate or cuspidate;

terminal scale spinose.

30–50, compressed, oblong-lanceoloid, 4–10 × 1.7–2.3 mm;

floral scales deciduous, 5–12, dark reddish brown, laterally 3–5-ribbed, ovate, 1.5–2.2 × 1–1.6 mm, apex with mucro 0.1–0.2 mm.

anthers 0.5–1 mm;

styles 1.5–2 mm;

stigmas 2 mm.

anthers 0.4–0.6 mm;

styles 0.4–0.6 mm;

stigmas 1–2 mm.

dark brown, narrowly oblong, (2.4–)2.7–2.9(–3.2) × 0.7–0.8 mm, base cuneate, apex obtuse, apiculate, surfaces puncticulate.

black, sessile, narrowly ellipsoid, 1–1.2 × 0.5–0.6 mm, apex obtuse, apiculate, glabrous, puncticulate, or papillose.