OregonFlora species comparison

0.5–1.8 mm thick;

nodes terete, 0–2 exserted.

nodes terete, 0–1 exserted.

intravaginal or intra- and extravaginal.

extra- and intravaginal.

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 33–50% of their length, bases of basal sheaths glabrous, collars of at least some leaves usually sparsely short-hairy;

ligules 1–2 mm, blades of tillers to 40 cm long;

upper surface moderately to densely scabrous or minutely hairy on and between the veins;

cauline blades involute, 1–3 mm wide;

lower surfaces smooth;

upper surfaces sometimes sparsely hairy;

blades much reduced higher on the culm; uppermost blades 1–4.5 cm.

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.

erect to nodding, lanceoloid to ovoid, loosely contracted; sparse, 4–8 cm;

spikelets 18–60;

branches ascending; lax, 3–8 cm long, 1–2 per node, with 3–8 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.

6–9(11)mm; to 3 times as long as wide;

florets 2–5(7);

rachilla internodes 1–2 mm long.

lanceolate;

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

subequal;

lower glumes 3-veined.

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

with diffuse; soft cobwebby hairs about 50% 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(7)mm, distinctly keeled, glabrous throughout; smooth or sparsely to moderately finely scabrous;

keels scabrous;

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 2–3 mm.

=28.