Flora of North America species comparison

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

to 150 cm, 2-4 mm thick at the nodes, rarely branched, leafy for 80% 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.

glabrous;

collars glabrous;

ligules 0.7-1 mm, entire;

blades (7)9-18(22) cm long, (4)10-22 mm wide, lanceolate-fusiform, usually glabrous, sometimes pilose adaxially.

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

branches ascending to appressed;

axils of panicle branches glabrous;

pedicels 0.5-2.5 mm.

(8)10-25(35) cm, open, lax;

branches nodding or drooping;

axils of panicle branches sparsely pilose;

pedicels 10-30 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°.

15-40(50) mm long, 6-16(20) mm wide, with 6-17(26) florets, lower 1-3 florets sterile, fertile florets diverging to 45°.

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.

4.2-9.1 mm, 5-7-veined;

upper glumes 4.7-8.7 mm, 5-9-veined;

calluses pilose;

fertile lemmas 9-12.5 mm, straight, 11-15-veined, keels winged, wings scabrous to pilose their full length;

paleas 4.6-7.7 mm;

anthers (0.4)0.6-2.6(3.5) mm, the length varying within a spikelet.

1.9-2.2 mm, exposed at maturity.

2.9-5 mm, enclosed, rarely exposed at maturity.

= 24.

= 48.