OregonFlora species comparison

intravaginal or intra- and extravaginal.

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 50% or more of their length;

ligules 1.5–5(10)mm, blades of tillers flat, 1–7(10) mm wide, finely scabrous;

cauline blades 2–10 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, eventually open, 10–25(30)cm; the branches eventually spreading or reflexed.

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.

(2)4– 6 mm;

florets 2–5;

rachilla internodes about 1 mm; smooth, softly puberulent or occasionally glabrous.

lanceolate;

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

slightly unequal;

keels and sometimes lateral veins scabrous;

lower glumes 1–3-veined.

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

with sparse cobwebby hairs on at least some florets.

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 to narrowly lanceolate, 2.5– 3.5 mm, distinctly keeled, evenly crisply puberulent near the base, finely scabrous distally;

margins narrowly hyaline;

tips narrowly acute, rarely purple.

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

0.2–1 mm.

0.5–1.8 mm thick;

nodes terete, 0–2 exserted.

nodes terete.