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.

15–60 cm, proximally scabrous.

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.

2.5–4 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.

proximal bracts usually shorter than, sometimes equaling, occasionally exceeding, inflorescences;

spikes spreading or erect, overlapping, contiguous, forming dense terminal cluster or, sometimes, proximal spikes separate, sessile, short-oblong, 7–12 × 6–10 mm;

lateral 2–3 spikes pistillate;

terminal spike gynecandrous.

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.

ascending or spreading, pale yellow, dark brown or blackish with green or yellow-brown margins, veinless, ovate or, rarely, circular, 3–4 × 2–3 mm, apex abruptly beaked, papillose on distal margins and serrulate;

beak 0.4–0.5 mm, shallowly or deeply bidentate, often serrulate.

substipitate, 2–2.5 × 1.7–1.8 mm.

filling proximal 1/2 or less of 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.

scales dark brown or black, distal margins often hyaline, ovate or lanceolate, shorter than or as long and broad as pergynia, midvein same color as body, inconspicuous, apex acute.

= 42.