OregonFlora species comparison

0.5–1.8 mm thick;

nodes terete, 0–2 exserted.

stout, 1.5–2 mm thick;

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 about 50% of their length, bases of basal sheaths glabrous;

collars smooth, glabrous;

ligules 1–5 mm;

blades moderately to densely scabrous or minutely hairy on and between veins, blades of tillers to 30 cm;

cauline blades involute; somewhat arcuate, 2–4 mm wide; uppermost blades 1–10 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; ovoid to lanceolate, contracted, often interrupted, 3–15 cm;

spikelets 15–80;

branches 1-2; erect, 1–6 cm; stiff, with 3–17 spikelets.

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.

9–17 mm; to 3 times as long as wide;

florets 3–6(10).

lanceolate;

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

broadly lanceolate, subequal to adjacent florets;

keels sparsely scabrous near tips;

lower glumes 3-veined;

upper glumes usually more than 7 mm, 3–5-veined.

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

usually with a line of crisp to sinuous hairs around the base of the lemma, sometimes glabrous or with diffuse; short; 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.

lanceolate; (6)7.5–11 mm, 5–7(11)-veined, distinctly keeled;

keels and marginal veins, sometimes also intermediate veins; short-villous to softly puberulent; area between veins smooth to scabrous, glabrous or softly puberulent;

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 (2)3–4(5)mm.

=28.