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.

23–88 cm × 0.5–1.6 mm, smooth.

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.

ligules 1–3.5 mm, 1–3 times as long as wide;

blades 1.1–4.4 mm wide, widest blade 1.3–4.4 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.

(12–)21–63(–71) mm;

proximal internode 3.3–16(–23) mm;

proximal bracts 5–24(–28) mm, awn 1.3–19 mm;

spikes 3–8, usually gynecandrous, sometimes also pistillate, staminate or with pistillate and staminate flowers scattered throughout;

proximal spikes with 0–2 staminate and 9–19 pistillate flowers, 10–17(–20) × 1.8–5 mm;

terminal spikes usually with 0–3 staminate and 8–18 pistillate flowers, 9–20(–25) × 1.5–5 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.

erect, green to pale brown, (3–)4–8-veined abaxially, prominently to weakly 3–6-veined adaxially, narrowly lanceolate, (3.3–)4.1–6.7 × 0.8–1.3 mm, (3.5–)4–6.1(–6.6) times as long as wide, apex abruptly contracted or gradually tapering;

beak 1.2–2.2(–2.8) mm, 0.28–0.51 times as long as perigynia, margins serrulate, apex entire or bidentulate, teeth to 0.2 mm, 0–0.05 times as long as perigynia.

substipitate, 2–2.5 × 1.7–1.8 mm.

1.7–2.2 × 0.7–1.1 mm, 1.9–2.9 times as long as wide.

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 with pale to red-brown margins, 2.8–4.1 × 1.1–1.6 mm, apex acuminate or with awn to 0.6 mm.

scales with pale to red-brown margins, 2.8–3.9 × 1.4–1.6 mm, apex acute to acuminate.

1.7–2.9 mm.

2–3.4 mm.

= 42.