OregonFlora species comparison

basal branching intravaginal.

with nodes hidden.

mainly basal;

sheaths open, glabrous but sometimes hairy, not conspicuously splitting between the veins, usually pale, becoming gray-brown with age;

collars glabrous;

ligules 0.1–0.4 mm;

blades 15–35 cm × 0.5–1.2(2.5)mm, conduplicate or occasionally flat;

outer surface usually glabrous, sometimes hairy;

inner surface glabrous, scabrous; hairy; flag leaves 7–12(18) cm.

mainly basal;

sheaths pale, glabrous, papillose, conspicuous at the base of the plant and persisting for more than 1 year; entire, forming a dense tuft of split tubes at the base of the plant;

collars glabrous;

ligules 0.1–0.5 mm;

blades 0.5–1.1 mm wide when tightly folded, 1.6–2.5(3)mm wide when flat or loosely rolled; somewhat stiff;

outer surface papillose;

inner surface with long hairs; flag leaves 2.5–7.5 cm.

(8)10–20(25)cm;

branches 3–7 cm, ascending to reflexed at anthesis, appressed after anthesis or sometimes the lowest spreading to reflexed.

5–18 cm; lowest node with 1–3 spreading branches 2.5–7(13)cm.

9.5–12(13.5)mm, 3–6 florets.

8–12(16) × 2.5–7 mm, with (3)4–5(7) florets.

glabrous or scabrous to short-hairy at the tip only;

lower glumes 2–5 mm, 1-veined;

upper glumes 4–5.5(6.2)mm, 3-veined.

glabrous or scabrous at the tips;

lower glumes 4.5–7.5(8.5)mm, 1(3)-veined;

upper glumes 5.3–8.2(9) mm; (1)3-veined.

glabrous.

3.5–4.5 mm; hairy at the tip.

apex glabrous.

apex hairy.

cross sections usually 0.4–0.8 × 0.75–1.2 mm, elliptic or L-shaped;

veins (5)7(10);

ribs 5(9); dorsal sclerenchyma bands more than 2 times wider than thick, sometimes restricted to the midrib and margins only.

(5.8)6.5–8.2 mm, 0(5)-veined, with hairs on the distal part only;

lemma awns 2–4(5)mm; shorter than or as long as the lemma body.

(6.2)7– 8.5(10)mm; (0)5-veined, slightly scabrous throughout, rarely glabrous;

lemma awns 0.5–1.5 mm.

3–5 mm.

(3.3)4.5–6 mm.

=28.