Flora of North America species comparison

60-120 cm, erect or spreading;

nodes (3)4-6(7), usually pilose;

internodes glabrous.

40-120 cm, erect or ascending.

pilose or glabrous;

auricles absent;

ligules 2-6 mm, glabrous, obtuse or truncate, erose or lacerate;

blades 13-25(33) cm long, to 14 mm wide, flat, abaxial surfaces usually glabrous, sometimes pilose, adaxial surfaces usually pilose, sometimes glabrous.

10-15 cm, open;

branches ascending to drooping.

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

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

15-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (3)4-9 florets.

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.

glabrous or pilose;

lower glumes 5-8 mm, 1(3)-veined;

upper glumes 8-12 mm, 3-veined;

lemmas 8-15 mm, lanceolate, rounded over the midvein, backs sparsely hairy or glabrous, margins usually coarsely pubescent, sometimes glabrous, apices subulate to acute, entire;

awns (4)6-12 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 2-4 mm.

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.

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.

= 14, 28, 56.