OregonFlora species comparison

nodes terete, 1–2 exserted.

intra- and extravaginal or mainly intravaginal.

mainly extravaginal.

sheaths closed to 25% of their length;

ligules 1–3 mm;

blades flat or folded, or slightly inrolled, 0.5–2 mm wide.

sheaths closed over 67% their length, bases of basal sheaths glabrous, collars of proximal leaves usually pubescent on and near the margins, collar margin hairs longer than those of the sheaths;

ligules 0.5–1.5 mm, ligules of lower culm and sterile shoot leaves to 1 mm, blades of tillers similar to cauline blades or sometimes longer;

cauline blades usually flat, 2–4.5 mm wide; smooth or upper surface sparsely scabrous mainly over the veins;

blades gradually reduced in length higher on the culm or middle blades longest; uppermost blades mostly 3–8 cm long.

erect, contracted, 1–3 cm long, usually exserted from the sheaths;

branches erect to steeply ascending; slender; to 1.5 cm.

erect or lax; ovoid to pyramidal; open or loosely contracted; sparse, 8–15 cm;

spikelets 25–80;

branches ascending to spreading; lax, 2.5–8 cm long, 3–5 per node, with 2–8 spikelets.

3–4 mm, green or purple;

florets 2–3;

rachilla internodes less than 1 mm long; smooth.

4–7 mm; to 3.5 times as long as wide;

florets 3–8;

rachilla internodes smooth or scabrous, glabrous or sparsely hispidulous.

lanceolate to broadly lanceolate, 2.4– 3.6(4) mm, usually equaling or exceeding the lowest lemma, frequently exceeding the upper florets;

lower glumes 3-veined.

lanceolate; over 67% as long as adjacent lemmas;

lower glumes 1–3(5)-veined.

glabrous.

glabrous or rarely with minute cobwebby hairs.

lanceolate, 2.5–3 mm long, distinctly keeled; thin, glabrous;

keels and marginal veins rarely sparsely puberulent;

tips acute.

lanceolate, 3–4.5 mm, distinctly keeled;

keels and marginal veins glabrous or infrequently sparsely short-hairy; area between veins glabrous or hispidulous; smooth or finely scabrous;

tips acute.

0.2–0.8 mm.

vestigial and 0.1–0.2 mm or 2.5–4 mm.

=14.