OregonFlora species comparison

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

terete or cross section elliptic (or rectangular), 10–50 cm × 0.2–0.7(1) mm.

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.

narrowly lanceoloid, 3–20 × 1.5–2.5 mm;

proximal scale amplexicaul; entire, subproximal scale empty or with flower; floral scales 15–40, 3–4 per mm of rachilla, 2–3 × 1 mm;

apex entire, rounded to obtuse in proximal part of spike; acute in distal part, keeled; at least in distal part of spike.

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

anthers 0.7–1.5 mm;

stigmas 3.

perianth bristles (0)3–7, often unequal; rudimentary to slightly exceeding tubercle;

anthers 1.1–2 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.

compressed-trigonous, 0.8–1.4 × 0.5–0.7 mm.

often splitting;

apex rounded (to acute).

persistent, not splitting;

apex with tooth often present on most or all culms; to 1 mm.

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

pyramidal, often higher than wide, 0.3–0.4 × 0.25–0.35 mm.

=20.

=10.