Flora of North America species comparison

45-125 cm tall, 1.8-3 mm thick, solitary or few together.

60-120 cm tall, 2.5-7 mm thick, solitary or few together, glabrous or pubescent below the nodes.

exceeded by the spikes, often basally concentrated;

sheaths glabrous or hairy, hairs 0.5-1 mm;

auricles to 1 mm;

ligules 0.2-1.3 mm, truncate, erose;

blades 10-35 cm long, 3.5-10 mm wide, flat to involute, usually stiffly ascending, adaxial surfaces usually scabrous, often also sparsely hairy, hairs to 0.8 mm, most abundant proximally, veins 11-27, closely spaced, subequal, prominently ribbed.

exceeded by the spikes, basally concentrated;

sheaths smooth, scabridulous, or hairy;

auricles to 1 mm;

ligules 0.5-1 mm, rounded to obtuse, sometimes erose;

blades 15-20 cm long, 5-7 mm wide, glaucous, stiff, involute, abaxial surfaces glabrous or hairy, sometimes scabridulous, adaxial surfaces scabrous, with 7-17 closely spaced subequal veins.

5-20 cm long, 5-15 mm wide, with 2 spikelets at midspike, sometimes 1 or 3 at other nodes;

internodes 5-11.5 mm, usually mostly smooth and glabrous, sometimes strigillose distally, edges ciliate, cilia to 0.4 mm.

10-25 cm long, 7-10 mm wide, with 2(3) spikelets per node;

internodes 8-10 mm, surfaces strigillose, hairs to 0.3 mm, edges ciliate, cilia to 1 mm.

10-22 mm, with 3-7 florets.

10-19 mm, with 2-3 florets.

5-16 mm long, 0.5-1.2 mm wide, bases not overlapping, glabrous and smooth proximally, scabrous distally, tapering from below midlength to the subulate apices, stiff, keeled, the central portion thicker than the margins, 1(3)-veined, veins inconspicuous at midlength;

calluses usually glabrous, occasionally with a few hairs, hairs about 0.1 mm;

lemmas 5-12 mm, usually glabrous, occasionally sparsely hairy, hairs to 0.3 mm, apices acute, usually awned, awns to 3 mm;

anthers 3-6 mm, dehiscent.

10-13 mm long, 0.5-2.5 mm wide, exceeded by the florets, narrowly lanceolate, tapering from the base, stiff, keeled, the central portion thicker than the margins, (0)1(3)-veined at midlength, bases expanded, overlapping, concealing the base of the lowest floret, scabrous;

lemmas 8-13 mm, densely hairy and not glaucous, hairs to 0.4 mm, or glabrous and glaucous, apices unawned or awned, awns to 2.5 mm;

anthers 3-4 mm, dehiscent.

= 28.

= 84.