OregonFlora species comparison

0.5–1.8 mm thick;

nodes terete, 0–2 exserted.

slender;

nodes terete, 0–1 exserted.

intravaginal or intra- and extravaginal.

mainly intravaginal; some 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 33–50% of their length; smooth, bases of basal sheaths glabrous;

collars smooth, glabrous;

ligules 0.5–1.5(2.2) mm, blades of tillers with upper surface moderately to densely scabrous or very short-hairy on and between the veins;

cauline blades involute, mostly filiform, 0.5–1(1.5)mm wide;

lower surfaces smooth;

upper surfaces sparsely scabrous on and between the veins; uppermost blade (0.5)1–5 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.

erect; ovoid, moderately to loosely congested, 1–5(7)cm;

spikelets fewer than 50;

branches erect to ascending, slightly lax, 0.5–3 cm, 1–2 per node.

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.

to 3 times as long as wide; compact, 3–6(8)mm;

florets 2–5;

rachilla internodes glabrous or sparsely softly puberulent.

lanceolate;

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

slightly unequal;

keels smooth or scabrous;

lower glumes 2–4 mm long, 1–3-veined; about 67% as long as the lowest lemma;

upper glumes 2.9– 5 mm long.

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

with sparse; diffuse; cobwebby hairs 1–2 mm, infrequently glabrous.

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, 2.5– 4(4.5)mm, distinctly keeled, moderately to densely finely scabrous, glabrous throughout or keels and sometimes marginal veins proximally sparsely softly puberulent;

margins narrowly scarious;

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 functional and 1.5–2 mm.

perennial; g ynodioecious, 7–30(35)cm tall, densely to loosely tufted, rhizomatous and stoloniferous;

rhizomes and stolons to 100 cm long.