Flora of North America species comparison

20-100 cm, ascending from a geniculate base.

5-150 cm, erect.

from shorter than to equaling the internodes, compressed;

ligules 0.7-1.7 mm;

blades 4-18(35) cm long, 2-10(14.2) mm wide, adaxial surfaces sparsely pilose, hairs papillose-based.

keeled, glabrous, scabrous, or slightly pubescent;

ligules 1.3-2 mm;

blades 2-35 cm long, 2-7 mm wide, flat, glabrous or scabrous (sparsely pilose).

2.5-12 cm;

rachis internodes 2-4 mm;

fascicles 5-10 mm long, 3.5-6(6.3) mm wide, imbricate;

outer bristles 10-20, terete, the majority no more than 1/2 as long as the inner bristles;

inner bristles 2-5 mm long, 0.6-1.5 mm wide, flattened, not grooved, mostly erect, fused for at least 1/2 their length into a globose cupule, sometimes interlocking at maturity, shortly pubescent, often purple at maturity.

2-15 cm;

fascicles 4-11 mm long, 2-4.5 mm wide;

bristles 30-60;

outer bristles numerous, less than 1/2 as long as the inner bristles, terete;

inner bristles 2.9-7 mm long, 0.2-1.1 mm wide, flattened, with 1-3 grooves abaxially, fused only at the base, forming a shallow disk, retrorsely scabrous, inner margins long-ciliate.

2-3(4) per fascicle, 4.8-7 mm.

1-3(4) per fascicle, 3.5-6 mm long, 1.2-1.9 mm wide;

lower glumes 0.5-2.5 mm;

upper glumes 2.5-4.9 mm, 3-5-veined;

lower lemmas 3.2-5.5 mm, 4-5-veined;

upper lemmas 3.4-5.9 mm;

anthers about 1.5 mm.

1.3-3.4 mm;

upper glumes 3.8-5.7 mm, 3-7-veined;

lower lemmas 4.5-6.5 mm;

upper florets 4.7-7 mm;

anthers 0.8-2.4 mm.

ovoid, 1.2-3.2 mm long, 1.3-2.2 mm wide.

2-3.4 mm long, 1-3.5 mm wide, ovoid.

= (34), 68.

= 34.