Flora of North America species comparison

20-100 cm, ascending from a geniculate base.

20-80 cm, wiry.

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.

shorter than the internodes, keeled, usually glabrous, rarely sparsely pilose;

ligules 0.2-0.6 mm;

blades 5-25 cm long, 1-3.5 mm wide, stiff, adaxial surfaces usually glabrous, smooth or scabrous.

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.

2-6(6.8) cm;

rachis internodes 2-4 mm;

fascicles 5-13 mm long, 2-4 mm wide, not imbricate, ovoid, glabrous;

outer bristles sometimes present, flattened;

inner bristles less than 30, 3.2-6 mm long, 0.2-1 mm wide at the base, in more than 1 whorl, fused for at least 1/2 their length into a distinct cupule, diverging at irregular intervals from the cupule, somewhat flattened, spreading, purple-tipped at maturity.

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

1-3 per fascicle, 4-7 mm.

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

1.8-3 mm long, 1-1.5 mm wide, ovoid-elliptic.

glumes 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.

glumes 1.4-3.1 mm;

upper glumes 3.2-5.4 mm, 3-5-veined;

upper lemmas 4-6 mm, 3-5-veined;

upper florets 3.9-6.5 mm;

anthers 0.9-1.9 mm.

= (34), 68.

= 34.