Flora of North America species comparison

2–40 cm × 0.5–1.5(–2) mm.

terete, to 90 cm × 2 mm.

apex of distal leaf sheath obtuse to acute, tooth to 0.3 mm.

distal leaf sheaths usually persistent, thinly membranous to papery.

lanceoloid to subcylindric or ovoid, 5–10(–20) × 2–3(–4) mm, apex acute (to rounded);

proximal scale empty, encircling ca. 2/3 of culm;

floral scales 25–100(–200), 8–12 per mm of rachilla, orangebrown to stramineous, 2(–2.5) × 1–1.3 mm, midribs mostly keeled, ovate, apex narrowly rounded to subacute.

terete, to 13 × 4 mm.

perianth bristles present or often absent, 5–8, brown, stout, rudimentary to slightly exceeding tubercle;

stamens (2–)3;

anthers brown to yellow, 0.3–0.7(–1) mm;

styles 2–3-fid.

styles 2-fid or with to ca. 1/2 3-fid.

0.9–1.1(–1.5) × 0.7–1.1 mm.

biconvex or rarely to ca. 1/2 trigonous;

angles keeled (costate), at least distally.

depressed, subdeltoid, 0.1–0.3(–0.4) × 0.6–0.9(–1) mm, 1/10–2/5 as high as wide, 1/4 or less as high as achene, 9/10 as wide as achene, very rarely 2/5 as high as achene (in E. engelmannii var. robusta).

distinct from achene apex in color, texture, and form.

= 10.