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.

straight, 10–75 cm.

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.

of flowering stems shorter than to slightly exceeding culms, 5–30 cm × 1.6–4.7(–5.8) mm;

ligules on distal cauline leaves truncate or rounded.

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 terminal spikes 0.4–5(–9) mm;

bracts to 18.5 cm × (0.7–)2–4.5 mm;

inner band of sheaths truncate or concave.

proximal pistillate spikes (1–)2–5, contiguous or approximate, globose to elliptic, 8–22 × 7.5–12.7 mm;

terminal staminate spikes sessile or pedunculate, 9–22 × 1.1–3 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.

reflexed, bright yellow at maturity, 4–6.3 × 1–1.9 mm, apex gradually narrowed;

beak 1.3–2.7 mm, forming angle of (15–)26–72° with body, scabrous.

substipitate, 2–2.5 × 1.7–1.8 mm.

1.3–1.7 × 0.9–1.2 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.

pistillate scales reddish brown, 2.3–3.9 × 0.9–1.4 mm; staminate scales reddish brown, ovate, margins narrowly whitish hyaline, apex obtuse.

1–2.1 mm.

= 42.

= 60.