OregonFlora species comparison

0.5–1.8 mm thick;

nodes terete, 0–2 exserted.

intravaginal or intra- and extravaginal.

mainly pseudointravaginal.

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

ligules 0.5–2 mm long;

blades flat, 1.5–5 mm wide.

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.

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

branches ascending, 1–3 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.

3.5–7 mm;

florets (1)2(4);

rachilla internodes about 1 mm long.

lanceolate;

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

keels scabrous;

lower glumes 1-veined;

upper glumes shorter than or subequal to lowest lemma.

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

with sparse cobwebby hairs.

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.

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

tips acuminate.

vestigial and 0.1–0.2 mm, aborted late in development, or well developed and 2–3.5 mm.

0.5–1.2 mm.