Flora of North America species comparison

20-110 cm, erect or ascending.

70-180 cm, erect;

nodes 3-7, pubescent or puberulent;

internodes pubescent, puberulent, or glabrous.

densely pubescent, hairs to 1 mm, collars with hairs to 2 mm, midrib of the culm leaves not abruptly narrowed just below the collar;

auricles sometimes present;

ligules 1-3 mm, densely pubescent to pilose, obtuse, lacerate;

blades (13)18-38 cm long, 3-12 mm wide, flat, sparsely to 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.

14-27 cm long, very open, nodding;

branches flexuous, usually widely spreading, with spikelets near the tips.

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.

20-37(45) mm, elliptic to lanceolate, terete to moderately laterally compressed, with 4-9(10) 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.

pubescent, with prominent veins, margins not bronze-tinged;

lower glumes 4-8.5 mm, (1)3-veined;

upper glumes 7-10 mm, 3(5)-veined, not mucronate;

lemmas 9.5-14 mm, lanceolate, rounded over the midvein, backs pilose, pubescent, or glabrous, margins pilose, not bronze-tinged, apices subulate to acute, entire;

awns 3-7 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.

= 14.