OregonFlora species comparison

terete, 2–40 cm × 0.5–1.5(2) mm.

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

lanceoloid to subcylindric, 5–10(20) × 2–3(4) mm;

proximal scale empty, encircling approximately 67% of culm; floral scales 25–100(200), 8–12 per mm of rachilla, 2(2.5) × 1–1.3 mm;

apex narrowly rounded to subacute.

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 present or often absent; (0)5–8; about as long as the achenes;

anthers 0.3–0.7(1) mm;

stigmas 2–3.

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

anthers 1.1–2 mm;

stigmas 3.

biconvex or to 33% greatly compressed trigonous, 0.9–1.1(1.5) × 0.7– 1.1 mm.

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

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

persistent, not splitting;

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

depressed, subdeltoid, 0.1–0.3(0.4) × 0.6–0.9(1) mm, 10–40% as high as wide, 25% or less as high as achene, 90% as wide as achene.

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

=10.