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.

14–66 cm × 0.4–1 mm, smooth or scabriduous.

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 2.7–6.9 mm, 2.5–6 times as long as wide;

blades 0.9–2.3 mm wide, widest blade 1.3–2(–2.3) 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.

16–58(–87) mm;

proximal internode 5.7–32(–46) mm;

proximal bracts 3.8–18(–34) mm, awn 0.4–15(–31) mm;

spikes 4–6(–7), usually gynecandrous, sometimes pistillate;

lateral spikes with 0–5 staminate and 8–18 pistillate flowers, longest proximal spike 5.5–9.8 × 4–5.6 mm;

terminal spikes usually with 2–9 staminate and 4–18 pistillate flowers, 6.2–13 × 2.9–6.8 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.

ascending to spreading or occasionally recurved, green to brown and often ferruginous tinged apically, prominently to weakly 3–8-veined adaxially, 7–14-veined abaxially, ovate to narrowly ovate, 2.3–3.7 × 1.1–1.5 mm, 1.8–2.5(–3) times as long as wide, apex abruptly contracted or gradually tapering;

beak 0.4–1.1(–1.3) mm, 0.15–0.33(–0.38) times as long as perigynia, margins sparsely serrulate or entire, apex entire or bidentulate with teeth to 0.1 mm, teeth 0–0.03 times as long as perigyina.

substipitate, 2–2.5 × 1.7–1.8 mm.

1.3–2 × 0.9–1.2 mm, 1.4–1.7 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 margins ferruginous to castaneous or occasionally stramineous, 2–2.7 × 1.4–1.7 mm, apex acute.

scales with margins ferruginous to castaneous or occasionally stramineous, 2.5–3.6 × 1.5–1.8 mm, apex acute.

1.1–1.4 mm.

0.8–1.4 mm.

= 42.

= 56.