Flora of North America species comparison

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

70-270 cm tall, 2-5 mm thick, many together, lowest nodes often pubescent, sometimes pubescent up to 1.5 cm below the inflorescence.

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;

sheaths glabrous or hairy;

auricles to 1.5 mm;

ligules 1.5-8 mm;

blades 15-45 cm long, 3-12 mm wide, strongly involute to flat, abaxial surfaces glabrous, adaxial surfaces scabrous, 11-25-veined, veins subequal, prominently ribbed.

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.

10-29 cm long, 8-17 mm wide, with 14-28 nodes and 2-7 spikelets per node;

internodes 4-9 mm.

10-22 mm, with 3-7 florets.

9-25 mm, with 3-7 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.

8-18 mm long, 0.5-2.5 mm wide, subulate distally, stiff, keeled, the central portion thicker than the margins, tapering from below midlength, smooth or scabrous, 0-1(3)-veined, veins inconspicuous at midlength;

lemmas 6.5-12 mm, glabrous or hairy, hairs 0.1-0.3 mm, apices acute or awned, awns to 3 mm;

anthers 4-7 mm, dehiscent.

= 28.

= 28, 56.