Flora of North America species comparison

40-130 cm, to 1 mm thick at the nodes, unbranched, leafy for 50% of their height.

60-150 cm, (1)2-3.5 mm thick at the nodes, unbranched, leafy for 40% of their height.

glabrous;

collars glabrous;

ligules 0.2-0.4 mm, entire;

blades (8)15-35(40) cm long, 3-8(11) mm wide, linear-lanceolate, usually glabrous, sometimes sparsely pilose adaxially.

pilose;

collars pilose;

ligules 0.2-0.3 mm, entire;

blades (15)20-50 cm long, 4.5-9.5(15) mm wide, linear-lanceolate,

(7)12-35(47) cm, contracted, erect;

branches ascending to appressed;

axils of panicle branches glabrous;

pedicels 0.5-2.5 mm.

(9)20-70 cm, contracted or open, erect;

branches tightly appressed or ascending to strongly divergent;

axils of panicle branches glabrous or scabridulous at the edges;

pedicels 0.3-2.5(5) mm.

4-9 mm long, 2-6 mm wide, with (2)3-5(7) florets, lower 1(2) florets sterile, fertile florets divergent to 45°.

4-10 mm long, 6-9 mm wide, with 4-7(8) florets, lower 1(2) florets sterile, fertile florets divergent to 80°.

1.3-3 mm, (1)3-5-veined;

upper glumes 1.3-2.5 mm, 3-5-veined;

calluses glabrous;

fertile lemmas 2.9-4.5 mm, straight, 3-7-veined, keels not winged, apices scabridulous;

paleas 2.3-3 mm;

anthers 1.3-1.5 mm, the length invariant within a spikelet.

1.2-2.7 mm, 3-5-veined;

upper glumes 1.4-2.2 mm, 3-5-veined;

calluses glabrous;

fertile lemmas 3.5-5.9 mm, usually curved or irregularly contorted, 7-9-veined, keels not winged, apices scabridulous;

paleas 2.8-4 mm;

anthers (0.8)1.3-1.6 mm, varying in length within a spikelet.

1.9-2.2 mm, exposed at maturity.

2-2.5 mm, exposed at maturity.

= 24.

= 24.