Flora of North America species comparison

20-110 cm, erect or ascending.

50-100 cm, erect;

nodes (1)2-3, usually glabrous, rarely pubescent;

internodes usually glabrous, rarely pubescent.

glabrous or pilose;

auricles absent;

ligules to 1.5 mm, glabrous, truncate, lacerate;

blades 10-20 cm long, 2-6 mm wide, often involute or folded, glabrous or sparingly hairy.

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

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

10-20 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 5-8(12) 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;

lower glumes 7-9 mm, 1-veined;

upper glumes 9-11 mm, 3-veined;

lemmas 10-13(15) mm, lanceolate, rounded over the midvein, backs and margins glabrous or sparsely pubescent, apices subulate to acute, entire;

awns 5-7 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 4-6.5 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.

= 56.