Flora of North America species comparison

40-120 cm, erect or ascending.

50-130 cm, erect, single or a few together;

nodes (2)3-5(6), usually glabrous, rarely pubescent;

internodes usually glabrous, rarely pubescent.

usually glabrous, rarely pubescent or pilose;

auricles sometimes present;

ligules to 3 mm, glabrous, truncate, erose;

blades 11-35(42) cm long, 5-15 mm wide, flat, usually glabrous, rarely pubescent or pilose.

7-16 cm long, 3-6 cm wide, open, erect to ascending;

branches sometimes longer than the spikelets, slender, ascending to spreading.

10-20 cm, open, erect;

branches ascending or spreading.

14-18(30) mm, oblong-lanceolate, terete to moderately laterally compressed, not purple-tinged;

florets 4-9(11), bases concealed or visible at maturity;

rachilla internodes 1.5-2 mm, concealed or visible at maturity.

20-40 mm, elliptic to lanceolate, terete to moderately laterally compressed, sometimes purplish, with (5)8-10 florets.

usually glabrous, sometimes scabrous or pubescent;

lower glumes 5-7 mm, 5-veined;

upper glumes 6-9 mm, 7(9)-veined;

lemmas 8-11.5 mm long, 1.7-2.6 mm wide, elliptic to lanceolate, coriaceous, backs usually glabrous, distinctly 7(9)-veined, not ribbed, rounded over the midvein, margins scabrous or pubescent, bluntly angled, inrolled or not at maturity, apices acute to obtuse, bifid, teeth shorter than 1 mm;

awns 3-10 mm, straight, arising less than 1.5 mm below the lemma apices, awn of the lowest lemma shorter than the others;

anthers 0.7-1.7 mm.

glabrous;

lower glumes (4)6-8(9) mm, 1(3)-veined;

upper glumes (5)7-10 mm, 3-veined;

lemmas 9-13 mm, elliptic to lanceolate, rounded over the midvein, usually glabrous and smooth, sometimes scabrous, margins sometimes sparsely puberulent, the basal part of the backs less frequently so, apices acute to obtuse, entire;

awns absent or to 3 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 3.5-6 mm.

equaling or shorter than the paleas, weakly to strongly inrolled.

sheaths densely hairy, hairs stiff, often retrorse;

upper sheaths pubescent or glabrous;

ligules 1-2.5 mm, glabrous or pilose, obtuse, ciliolate;

blades 9-18 cm long, 2-4 mm wide, pilose on both surfaces.

= 14, 28, 56.

= 28, 56.