Flora of North America species comparison

20-110 cm, erect or ascending.

90-150 cm, erect;

nodes 1-2(3), pubescent or puberulent;

internodes usually puberulent, occasionally glabrous, pilose to densely pubescent below the nodes.

densely pubescent to pilose, hairs to 1 mm, collars pilose, hairs to 2 mm;

auricles absent;

ligules 0.5-2.5 mm long, sparsely to densely pubescent, obtuse, erose;

blades 7.5-16.5 cm long, 3-12 mm wide, flat, densely pubescent on both surfaces.

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

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

5-16 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.

25-35(45) mm, terete to moderately laterally compressed, with 3-7 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.

sparsely to densely pubescent;

lower glumes 5-8(9) mm, 1(3)-veined;

upper glumes (7)8-9 mm, 3-veined, sometimes mucronate;

lemmas 10-14 mm, elliptic, rounded over the midvein, backs sparsely to densely pubescent, margins pubescent, apices entire;

awns 3.5-7 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 3-6 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.

= unknown.