Flora of North America species comparison

to 100 cm × 2 mm, scabrous.

dark maroon at base; flowering stems 40–90 cm, much longer than leaves at maturity, 0.5–1 mm thick, sparingly pilose.

sheath fronts spotted red-brown or pale brown, apex truncate or short-convex, membranous or hyaline, rugose;

ligule retuse or rounded, to 2 mm, free limb to 0.2 mm;

blades 120 cm × 5 mm, longer than flowering stem.

basal sheaths maroon, bladeless, pilose;

others grading from maroon to green on back, pale to chestnut brown-hyaline and usually red dotted on front, ciliate at apex;

blades flat, 2.5–9 mm wide, pilose on both surfaces, sparsely so adaxially, margins smooth or ciliate.

spicate, (3–)7–10 cm × 15 mm, with 10–15 branches, the proximal branches distinctly separate; the proximal internode to 25 mm;

bracts setaceous, those subtending at least the proximal lateral branches conspicuous.

peduncles of lateral spikes capillary, 10–20 mm, glabrous or pubescent;

peduncle of terminal spike erect, 3–5 mm;

proximal bracts hyaline, reduced to green awn or less often leaflike and 0.3–1.5 mm wide;

sheaths usually less than 3 mm (to 10 mm).

green to pale brown, veinless on both faces or 3-veined abaxially, body ovate or elliptic, 2–3.2 × 1.3–1.8 mm, base obtuse;

beak 0.8–1.2 mm, 1/3–1/2 length of perigynium.

light green, usually red dotted, 2-ribbed and 5–7-veined, at least proximally and abaxially, loosely enveloping achene, ellipsoid, 2.5–5 × 1.3–2.5 mm, membranous, base acute, apex tapering to beak, glabrous;

beak bidentate to 1.5 mm, teeth 0.5 mm, ciliate between apical teeth.

red-brown, ovate, 1.2–1.4 × 1 mm, glossy.

substipitate, 1.5–2 × 1–1.5 mm.

pale brown, hyaline, awn to 3 mm.

spikes 2–4, 1 per node, mostly near apex but not crowded, drooping at maturity, pistillate with 10–40 perigynia attached 1 mm apart, narrowly cylindric, 8–25 × 4–5 mm.

spike staminate, sessile or pedunculate, 10–30 × 1.4–3 (4) mm.

scales hyaline suffused with chestnut with broad green midrib, ovate, shorter to nearly as long as mature perigynia, apex acute to cuspidate, awns less than 1 mm, often ciliate distally.

= 52.

= 44, 64.