Flora of North America species comparison

20-110 cm, erect or ascending.

90-150 cm, erect;

nodes 2-4, pubescent or puberulent;

internodes glabrous to pubescent, pilose to densely pubescent below the nodes.

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

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

7-13.5 cm, open;

branches erect, ascending and appressed to slightly spreading.

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.

20-40 mm, elliptic to lanceolate, terete to moderately laterally compressed, with 3-9(11) 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.

usually glabrous, occasionally scabrous or pubescent;

lower glumes 5-9 mm, 1(3)-veined;

upper glumes 7-11 mm, 3(5)-veined, sometimes mucronate;

lemmas 9-16 mm, elliptic, rounded over the midvein, backs usually pubescent, sometimes glabrous or scabrous, margins pubescent or scabrous, apices obtuse, entire;

awns (4)5.5-8 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 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.

sheaths sparingly to densely pilose, hairs 2-4 mm, occasionally glabrous;

upper sheaths hairy, hairs to 1 mm, collars glabrous or pilose, hairs to 4 mm;

auricles absent;

ligules 1-3 mm, usually glabrous, occasionally pilose, obtuse, erose;

blades 7-24 cm long, 3-12 mm wide, flat, usually glabrous, sometimes hairy.

= 28.

= 14.