Flora of North America species comparison

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

60-122 cm tall, 2-3.5 mm thick, sparsely to densely pubescent below the spike.

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;

auricles to 1 mm;

ligules 0.4-1.2 mm;

blades to 9 mm wide, veins promimently ribbed, subequal, closely spaced.

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.

7-32 cm long, 7-11 mm wide, sometimes glaucous, often purplish or green with traces of purple, with 1-2 spikelets per node;

internodes 8-12 mm, surfaces hairy distally, hairs 0.1-0.3 mm, edges ciliate, hairs to 1 mm, coarser than the surface hairs.

10-22 mm, with 3-7 florets.

15-20 mm, with 2-6 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.

9-28 mm long, 1.5-4 mm wide, lanceolate, glabrous towards the base, pubescent distally, midveins glabrous or with hairs to about 1.3 mm, stiff, keeled or flat proximally, keeled distally, the central portion thicker than the margins, 3(5)-veined at midlength, tapering from below midlength to an awn, awns to 4 mm;

lemmas 8-10 mm, usually completely glabrous, margins and apices sometimes pubescent, apices tapering to an awn, awns to 4 mm;

anthers 3.3-7.3 mm, indehiscent.

= 28.

= 28, 42.