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.

lateral, erect or ascending, usually overtopping vegetative shoots, 24–54 cm × 0.7–1 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 purple, 7–18 mm;

blades erect or ascending, evergreen, midrib and 2 lateral veins strongly developed, 14–42 cm × 8–32 mm, older leaves often shriveling or dead at tips.

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.

spikes 3–5 per culm, scattered;

peduncle of pistillate spikes erect or spreading, rarely drooping, exserted 0–18 mm;

bracts from middle and proximal portions of culms reduced, 0.8–2 cm × 2–3.5 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.

(4–)9–13(–15) per spike, overlapping, finely veined, elliptic, 3.7–4.9 × 1.6–2 mm;

beak constricted.

ascending from achene through entire orifice.

substipitate, 2–2.5 × 1.7–1.8 mm.

ovoid, 2.2–2.7 × 1.5–1.9 mm, sides flat to slightly concave at maturity, tightly fitting in perigynia.

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.

spikes the proximal basal, 8–30 × 4–7 mm.; pistillate scales slightly keeled, 3.2–4.2 × 1.8–2.2 mm, midribs green, margins hyaline with purple outward, apex cuspidate to acuminate to acute.

spike 1, pedunculate, oblanceolate to linear, 8–20 × 2–3.5 mm.; staminate scales 3–6 × 1.5–2 mm, midveins green or purple, margins dark purple, apex obtuse.

3.2–4.2 mm.

= 42.

= 50, 52.