Flora of North America species comparison

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

50-100 cm tall, 8-12 mm thick, solitary or few together, mostly smooth and glabrous, scabridulous or pubescent below the spikes, hairs to 0.5 mm.

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;

ligules 1.5-2.5 mm;

blades 20-40 cm long, 8-20 mm wide.

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.

15-35 cm long, 10-20 mm wide, dense, with 3-8 spikelets per node;

internodes 8-11 mm, surfaces hairy, hairs to 1 mm, on the edges to 1.5 mm.

10-22 mm, with 3-7 florets.

12-25 mm, sessile, with 4-6 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.

12-25 mm long, to 2 mm wide, usually exceeding the lemmas, linear-lanceolate at the base, tapering from below midlength, stiff, glabrous at least at the base, the central portion thicker than the margins, keeled and subulate distally, 1-veined, veins inconspicuous at midlength;

lemmas 15-20 mm, pubescent proximally, glabrous distally, tapering to an awn, awns 1.5-2.5 mm;

palea keels usually glabrous, sometimes ciliate distally;

anthers about 5 mm, dehiscent.

glaucous.

= 28.

= 28.