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.

extra- and intravaginal.

mainly pseudointravaginal.

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 approximatly 90% of their length; to near the collar;

ligules 0.5–2 mm long;

blades flat, 1.5–5 mm wide.

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.

lax, narrowly lanceolate, 6–22 cm; sparse;

branches ascending, 1–3 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.

3.5–7 mm;

florets (1)2(4);

rachilla internodes about 1 mm long.

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.

keels scabrous;

lower glumes 1-veined;

upper glumes shorter than or subequal to lowest lemma.

with sparse cobwebby hairs.

narrowly lanceolate, 3.2–5 mm long, distinctly keeled, glabrous; smooth;

tips acuminate.

0.5–1.2 mm.