Flora of North America species comparison

20-110 cm, erect or ascending.

50-100 cm, erect;

nodes 2-3(4), glabrous, internodes glabrous or puberulent just below the nodes.

glabrous;

auricles absent;

ligules to 1 mm, glabrous, truncate;

blades (8)12-19(24) cm long, 4-8(14) mm wide, flat, glabrous, margins scabrous.

4-16 cm long, 2-3 cm wide, erect, open;

branches sometimes longer than the spikelets, slender, usually ascending, slightly curved or straight.

6-14 cm, erect, contracted;

branches erect or ascending.

12-20 mm, lanceolate, terete to moderately laterally compressed;

florets 5-6, bases concealed at maturity;

rachilla internodes 1-1.5 mm, concealed at maturity.

15-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (3)5-7 florets.

smooth to scabrous;

lower glumes 4-6 mm, (3)5-veined;

upper glumes 4-7 mm, 7-veined;

lemmas 6.5-8 mm long, 3-4.5 mm wide, elliptic to lanceolate, coriaceous, backs smooth, distinctly 7(9)-veined, not ribbed, rounded over the midvein, margins scabrous, rounded, not inrolled at maturity, apices acute to obtuse, bifid, teeth shorter than 1 mm;

awns 5-9 mm, all more or less equal in length, straight, arising less than 1.5 mm below the lemma apices;

anthers 1.5-3 mm.

glabrous or sparsely pubescent;

lower glumes 7-11 mm, 1(3)-veined;

upper glumes 9-12 mm, 3-veined;

lemmas 12-15 mm, elliptic, rounded over the midvein, backs and margins pubescent or nearly glabrous, apices obtuse, entire;

awns 2-5 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 2-3.5 mm.

shorter than the paleas, thin, weakly inrolled or flat.

sheaths densely hairy, hairs stiff, often retrorse;

upper sheaths glabrous or pubescent;

ligules 1-2 mm, glabrous or hairy, erose;

blades 7-18 cm long, 1-4 mm wide, pilose on both surfaces.

= 28.

= 14.