Flora of North America species comparison

brown at base, densely covered with brown fibrillose remains of previous year’s leaves; flowering stems 30–90 cm, longer than leaves at maturity, 0.5–0.7 mm thick, glabrous but finely scabrous within inflorescence.

densely tufted, central or lateral, rarely erect, ascending, lax, or, occasionally, decumbent, slightly winged, 14–53 cm × 0.8–1 mm.

sheaths glabrous, basal ones tinged with brown and all bearing blades, green to hyaline on back, white-hyaline on front;

blades flat, 2.5–4 mm wide, finely scabrous on adaxial surface and margins, glabrous on abaxial surface.

basal sheaths brown or light brown;

sheaths 1–48 mm;

blades erect, ascending or lax, green, midrib well developed abaxially, lateral veins developed adaxially, flat, 14–36 cm × 1–10 mm, blades of overwintering leaves smooth abaxially.

0.9–17 cm × 1–8 mm, bract blade of distal lateral spikes linear, narrower than spikes, not concealing them (viewed from abaxial surface), widest bract blade of distalmost lateral spike 0.5–3.4 mm wide.

peduncles of lateral spikes slender, 20–60 mm, equaling or somewhat longer than spikes, finely scabrous;

peduncle of terminal spike 5–15 mm, scabrous;

proximal bracts equaling inflorescences or more often shorter;

sheaths 3–5 mm or rarely longer;

blades 1–1.5 mm wide.

peduncles of proximal absent; of terminal spike 0–1.7 cm.

4(–5) per culm;

lateral spikes scattered or distal 2 proximate, 15–18 × 3–4 mm;

terminal spike overtopping or proximate to proximal pistillate spikes, linear, 9–20 × 1.8–2.4 mm.

shiny tan to golden green, 2-ribbed, but otherwise veinless, closely enveloping achene at maturity, ovoid-ellipsoid, 4.5–6.5 × 1.5–2 mm, membranous, base acute, apex abruptly contracted to beak, glabrous;

beak bidentate, narrowly tubular, nearly as long as body, finely scabrous on edge, teeth hyaline, 1 mm.

4–18 per spike, closely overlapping, ratio of longer lateral spike length to perigynia number 0.8–1.7, aggregated, ascending, conspicuously (22–)25–32-veined, obovate to elliptic-obovate, 2.5–3.8(–4.1) × 1.3–2.2 mm, 1.5–1.9 times as long as achene bodies;

beak abruptly bent, 0.2–0.6 mm.

substipitate, 2–2.5 × 1.7–1.8 mm.

obovoid, 2.1–3.2 × 0.8–1.8 mm.

spikes 4–5, 1 per node;

proximal spikes well separated, nodding or drooping at maturity, pistillate with 10–40 perigynia about 1 mm apart, cylindric, 10–35 × 8–10 mm;

distal spikes crowded near apex, sessile or nearly so, staminate or androgynous, linear, less than 20 mm.

spike staminate or rarely with a few perigynia at base, 10–20 × 1.5–2 mm.

scales pale hyaline tinged with chestnut, narrow midrib green, sometimes finely scabrous, ovate-oblong, shorter than mature perigynia, apex long-acuminate, glabrous.

scales 2.8–3 × 1.4–1.6 mm, apex apiculate to aristate, awn to 1.5 mm.

scales 1.8–3.2 × 1.4–1.8 mm, margins hyaline, apex acute or acuminate.

1.8–2.2 mm.

= 42.

= 30, 32, 34, 36.