OregonFlora species comparison

nodes terete or slightly compressed, 1–2(3) nodes exposed.

mainly extravaginal or equally extra- and intravaginal.

intra- and extravaginal or mainly intravaginal.

sheaths closed 25–50% of their length, bases of basal sheaths glabrous;

collars smooth, glabrous;

ligules truncate to rounded, 0.9–2(3.1)mm, blades of extravaginal shoots like cauline blades, those of intravaginal shoots; when present, sometimes distinctly narrower; flat to involute, 0.4–1 mm wide;

cauline blades flat or folded; to involute on the margins, 0.4–4.5 mm wide;

lower surfaces smooth, glabrous;

upper surfaces smooth or sparsely scabrous, frequently with sparse; slender hairs 0.2–0.8 mm long; uppermost blades 1.5–10 cm.

sheaths closed 10(20)% of their length, bases of basal sheaths glabrous;

ligules (0.8)2–6 mm long, blades of tillers usually 1–1.5 mm wide; thin; soon withering, distinctly narrower than those of the culm, infrequently broad and flat, or involute;

cauline blades flat or folded, 2–5 mm wide; soft; thin and soon withering or moderately thick and somewhat fleshy and retaining their form; smooth;

blades gradually reduced in length higher on the culm.

narrowly ovoid to narrowly or broadly pyramidal, loosely contacted to open, sparsely to moderately congested, 2–15(20)cm;

spikelets (25)30–100+;

branches spreading; (1)2–9 cm long; (1)2–7(9) per node;

spikelets 4–30(50), usually fairly crowded in distal half.

erect, nearly cylindrical, contracted, 3–7 cm;

spikelets (20)30–80(120);

branches 0.5–1.5(4.5)cm long, 3–7 per node, densely papillose and sparsely scabrous.

lanceolate to narrowly ovate; to 3.5 times as long as wide, 4.5–7 mm;

florets 3–5.

lanceolate, slightly unequal;

keels smooth and papillate or scabrous;

lower glumes 3-veined.

glabrous or with a crown of tiny crisp hairs around the base;

hairs 0.1–0.2 mm long.

lanceolate, distinctly keeled, 3–4.5 mm, glabrous, or keels and marginal veins short-villous on proximal half, sparsely crisply puberulent near the base;

margins glabrous;

tips acute.

1.5–3 mm.