OregonFlora species comparison

nodes terete to slightly compressed;

proximal nodes often slightly swollen; the uppermost node usually at or above the middle of the culm.

slender;

nodes terete, 0–1 exserted.

extra- and intravaginal.

mainly intravaginal; some extravaginal.

sheaths closed to 20% of their length, bases of basal sheaths glabrous;

ligules (1)1.5– 6 mm, truncate to acute;

blades flat, 1.5–8 mm wide, usually several on the culm, steeply ascending or spreading to 80°; upper blades often lax.

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.

lax, eventually open, sparsely to moderately congested; (9)13–30(41)cm, generally 33–50% as broad as long at maturity;

spikelets 25–100+;

branches initially erect, eventually widely spreading to slightly reflexed, fairly straight; slender, 4–15 cm, 33–50% of the panicle length, 2–9 per node.

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.

narrowly to broadly lanceolate, 3–3.5 times as long as wide, 3–5 mm;

florets (1)2–5;

rachilla internodes mostly less than 1 mm.

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

florets 2–5;

rachilla internodes glabrous or sparsely softly puberulent.

tapering from the base or lanceolate, distinctly keeled;

keels smooth or sparsely scabrous;

lower glumes 3-veined; long tapered to a slender point, 6.4–10 times as long as wide.

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.

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

rhizomes and stolons to 100 cm long.

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

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 or functional and 1.5–2 mm.