OregonFlora species comparison

intravaginal or intra- and extravaginal.

intra- and extravaginal or mainly extravaginal.

sheaths closed 25–75% of their length, bases of basal sheaths glabrous;

collars smooth or scabrous, glabrous, ligules of cauline leaves 1–3(6)mm;

tips truncate to acute, ligules of sterile shoots 0.2– 0.5(2.5)mm;

tips usually truncate;

blades involute to flat, 0.2– 3.5 mm wide; all about equal or the upper ones slightly reduced in length;

upper surface usually densely scabrous or hispidulous to softly puberulent, infrequently nearly smooth and glabrous;

lower surface smooth or scabrous; uppermost blade 0.5–5(6)cm.

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.

usually erect, tightly or loosely contracted, narrowly lanceoloid to ovoid, 2–10(12) cm;

spikelets 10–100;

branches erect or steeply ascending, 0.5–4(5)cm long, 1–3(5) per node, with 1–15 spikelets.

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.

broadly lanceolate to narrowly ovate; to 3 times as long as wide; (3)4–10 mm;

florets 2–6;

rachilla internodes 0.5–1.2 mm long.

(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.

lanceolate;

lower glumes 3-veined, distinctly shorter than the lowest lemma.

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

keels scabrous;

lower glumes 1–3(5)-veined.

glabrous or with short; sparse, sometimes diffuse cobwebby hairs less than 25% of the lemma length.

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

lanceolate to broadly lanceolate; (3)4–7 mm, distinctly keeled, membranous; smooth or sparsely to densely scabrous, glabrous throughout, or keels and/or marginal veins softly puberulent near the base;

tips acute.

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, aborted late in development, or well developed and 2–3.5 mm.

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

0.5–1.8 mm thick;

nodes terete, 0–2 exserted.

nodes terete, 1–2 exserted.

=28.