OregonFlora species comparison

terete, 2–40 cm × 0.5–1.5(2) mm.

terete or slightly compressed, 30–115 cm × 0.5–5 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.

ovoid to lanceoloid, 5–25 × 3–7 mm;

proximal scale clasping 67(75)% of culm, subproximal scales 1–2; empty; floral scales 30–100, 4–8 per mm of rachilla, 3–5 × 1.5–2.5 mm;

apex entire; acute or subacute, often keeled 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 4(5), sometimes absent; much shorter than achene to equaling tubercle, rarely to 2 times as long as achene;

anthers 1.5–2.2 mm;

stigmas 2; very rarely some 3.

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

biconvex, 1.1–2 × 1–1.5 mm.

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

persistent or sometimes disintegrating, often splitting adaxially;

apex lacking tooth.

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 to mammillate; as high as wide to 2 times higher, 0.3–0.7 × 0.35–0.7 mm.

=16, 27, 36.