Flora of North America species comparison

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

35-40(90) cm, 0.8-1 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 pilose;

ligules 0.2-0.3 mm, irregularly laciniate;

blades 7-9(15) cm long, 3.5-6 mm wide,

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

branches ascending to appressed;

axils of panicle branches glabrous;

pedicels 0.5-2.5 mm.

(2.5)5-10.5(12) cm, open, erect;

branches divergent, sometimes strongly so;

axils of panicle branches pilose;

pedicels 0.5-1 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°.

9.5-12 mm long, 11-17(18) mm wide, with (4)5-10 florets, lower 2-4 florets sterile, fertile florets divergent to 85°.

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.

2.5-2.9 mm, 2-3-veined;

upper glumes 2.6-3.6 mm, 3-5-veined;

calluses glabrous;

fertile lemmas 5.8-9.3 mm, straight, (9)11-13-veined, keels not winged, scabrous to scabridulous distally;

paleas 7.2-9 mm;

anthers 1.1-1.9 mm, the length invariant within a spikelet.

1.9-2.2 mm, exposed at maturity.

2-3 mm, enclosed at maturity.

= 24.

= 24.