OregonFlora species comparison

sometimes arching; terete to sometimes distinctly compressed, 1–60 cm × 0.2–0.5(0.7) mm.

subterete to slightly compressed; to 2 times wider than thick, 5–15 cm × 0.2–0.5(1.2) mm; culm tufts often proximally bulbous (if bulbous then tunicated by papery-fibrous scales).

2–8 × 1–2 mm; floral scales 4–25, 4–6 per mm of rachilla, 1.5–2.5(3.5) × 1–1.5 mm;

apex blunt to acute.

with proximal internodes shorter and thicker than those in the middle of the spike, 3–8 × 1.5– 4 mm;

proximal scale subtending a flower; seldom empty, 2–5 mm, 50% or more as long as spike; floral scales 3–10 per spike, 2.5–6 × 1.5–2.5 mm.

perianth bristles mostly absent, uncommonly 2–4; shorter than to equaling achene;

anthers 0.7–1.5 mm;

stigmas 3.

perianth bristles (0)3–6, often unequal; rudimentary to equaling tubercle;

anthers 1.5–2.7(3.5) mm;

stigmas 3.

with angles plus about 8–12 obscure to prominent longitudinal ridges, narrowly to broadly obovoid to obpyriform, 0.7–1.1 × 0.35–0.6 mm; fine horizontal ridges 30–60, clearly evident to crowded and obscure; spaces between trabeculae sometimes translucent.

equilaterally trigonous to compressed-trigonous, rarely some biconvex, 1.6–2.3 × 0.7–1.3 mm.

often splitting;

apex rounded (to acute).

apex often reddish, subtruncate to acute.

pyramidal to much depressed; (0.05)0.1–0.2 × 0.15– 0.25 mm.

rarely absent, 0.3–0.4 × 0.2–0.3 mm.

=20.