OregonFlora species comparison

intra- and extravaginal or mainly extravaginal.

sheaths closed 50–67% of their length, bases of basal sheaths glabrous;

collars smooth, glabrous, ligules of cauline leaves acute to acuminate, 2–8 mm long, ligules of sterile shoots 2–5 mm long, blades of tillers to 20 cm long; otherwise similar to cauline blades;

cauline blades usually flat or V-shaped, occasionally folded, 1–3.5 mm wide; smooth or sparsely scabrous mainly over the veins and margins, distinctly keeled;

blades gradually reduced higher on the culm; uppermost blades (1.4)3–6(8)cm long.

nodding at the tips; ovoid; sparse; (2)4–10 cm;

spikelets 20–50;

branches ascending to spreading; lax, 1.5–4.5 cm long, 1–2(4) per node, with 2–7 spikelets.

(4)6–9(12)mm; to 3.5 times as long as wide;

florets 3–8;

rachilla internodes smooth or sparsely scabrous, glabrous or infrequently sparsely softly puberulent.

narrowly lanceolate to lanceolate; over 50% as long as adjacent lemmas;

keels scabrous;

lower glumes 1–3(5)-veined.

nodes terete, 1–2 exserted.

with cobwebby hairs more than half as long as the lemma.

lanceolate, 4–6.5 mm, distinctly keeled;

keels and marginal veins sparsely short- to long-villous; area between veins sparsely scabrous, glabrous, 5–7-veined;

tips acute.

vestigial and 0.1–0.2 mm, or 2.5–4 mm.

=28.