Flora of North America species comparison

dark maroon at base; flowering stems 30–90 cm, longer than leaves at maturity, 0.8–1 mm thick, glabrous but scabrous within inflorescence.

45–100 cm;

vegetative culms few, inconspicuous, usually fewer than 15 leaves, not strikingly 3-ranked, leaves clustered at apex.

basal sheaths maroon, bladeless, glabrous on back;

others grading from maroon to green on back, pale brown-hyaline and red dotted on front, pubescent near apex;

blades flat, 2.8–7.2 mm wide, glabrous on both surfaces, margins smooth or finely scabrous.

sheaths green or with white intervenal areas, often adaxially white-hyaline, summits U-shaped or prolonged to 2 mm beyond collar;

sheaths finely papillose or smooth;

distal ligules 1–3 mm;

blades 3–5 per fertile culm, 15–30 cm × 1–3.5 mm.

peduncles of lateral spikes slender, 5–100 mm, finely scabrous;

peduncle of terminal spike less than 15 mm, finely scabrous;

proximal bracts equaling inflorescences or shorter;

sheaths 10–70 mm;

blades 1.5–3.5 mm wide.

arching or nodding, ± open, green to light brown, 2.5–6 cm × 4.5–11 mm;

proximal internode 3–18 mm; 2d internode 3–13 mm;

proximal bracts scalelike or with bristle tips shorter than inflorescences.

3–10, distinct, ellipsoid to globose, 6–16 × 5–6.5 mm, base acute to attenuate, apex rounded;

terminal spike with conspicuous staminate base.

olive-green, copiously red dotted, conspicuously 10–12-veined, veins about equal in size, loosely enveloping achene, ovoid-ellipsoid to lance-ovoid, 4.6–9 × 1.2–2.2 mm, membranous to coriaceous, base with short stipe, apex tapering to very short beak, glabrous or short-pubescent;

beak minutely bidentate, 0.3–0.8 mm, ciliate between apical teeth.

(20–)25–60 in larger spikes, spreading, pale green to yellowish brown, conspicuously 5-veined or more abaxially, veinless or mostly indistinctly or basally 2–4(–6)-veined adaxially, orbiculate to elliptic, plano-convex, 2.5–4.2 × 1.5–2.3(–2.5) mm, 0.4–0.6 mm thick, nearly leathery, margin flat, including wing 0.3–0.6 mm wide, smooth;

beak green or light brown at tip, flat, ciliate-serrulate, abaxial suture with conspicuous white-hyaline margin, distance from beak tip to achene 0.8–1.7(–2) mm.

distinctly stipitate, 2–2.5 × 1–1.5 mm, stipe 1–1.5 mm.

ovate, 1.2–1.8 × 1–1.3 mm, 0.3–0.4 mm thick;

style sometimes abaxially-adaxially bent at base.

spikes 3–5, 1 per node, well separated, erect to nodding or drooping at maturity, pistillate with 10–40 perigynia attached 1–3 mm apart, narrowly oblong-cylindric, 10–50 × 4–5 mm.

spike staminate or sometimes gynecandrous with a few pistillate flowers distally, 12–55 × 1–2 mm.

scales suffused with reddish brown to chestnut with hyaline margins and broad green midrib, ovate-oblong, shorter than mature perigynia, apex obtuse, acute, or sometimes mucronate, glabrous except scabrous midrib.

scales white-hyaline with white, green, or gold center, broadly lanceolate, 2.3–3.8 mm, shorter than and narrower than perigynia, apex acute.

1–2.1 mm.

= 42, 44, 46, 48, 50.

= 68, 70.