Flora of North America species comparison

to 45 cm × 0.2–1 mm.

20–35 cm × 0.3–1 mm.

distal leaf sheaths persistent, firm, distally tightly sheathing, apex acute.

apex of distal leaf sheath subacute to narrowly acute, tooth to 0.3(–1.1) mm.

orbicular to ovoid, 1–9 × 1–4 mm, apex rounded to acute;

proximal scale without flower, not amplexicaulous;

floral scales to 125, 11–14 per mm of rachilla, tightly appressed, dark red-brown to stramineous, ovate to elliptic, 0.8–3 × 0.6–2(–2.3) mm, membranous to cartilaginous, apex rounded to acute.

narrowly lanceoloid, 3–12 × (1–)2–2.5(–4) mm, apex acute;

floral scales 25–100, 10–12 per mm of rachilla, orangebrown to stramineous, ovate, 1.5–2 × 1 mm, midribs mostly keeled, apex acute or narrowly rounded in proximal part of spikelet.

perianth bristles (0–)4–8, typically 7, red-brown, rarely whitish, vestigial to much exceeding tubercle, typically equaling achene, spinules few to dense;

styles 2-fid.

perianth bristles 6–7, brown, stout, the longest equaling or exceeding tubercle;

stamens 2–3;

anthers brown, 0.3 mm;

styles 2-fid.

brown ripening to black, biconvex, orbicular to obpyriform, 0.5–1.1 × 0.3–0.7 mm, apex rarely constricted proximal to tubercle, very finely reticulate at 40X.

0.9–1.1 × 0.6–0.8 mm.

stramineous to whitish, umbonate to subconic, 0.2–0.4 × 0.2–0.5 mm, apex rounded to acute.

deltoid, 0.25–0.5 × 0.5–0.7 mm, 1/2–2/3 as high as wide, 1/4–1/2 as high and 2/3–4/5 as wide as achene.

= 10.

= 10.