Flora of North America species comparison

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

40-120 cm tall, 2-4 mm thick, pubescent beneath 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;

sheaths glabrous;

auricles absent, sometimes with a few hairs in the auricular position;

ligules 0.3-1.5 mm;

blades 3-4 mm wide, usually involute, adaxial surfaces scabrous, sometimes with scattered hairs, hairs to 1 mm, with about 15 closely spaced, subequal, mostly prominently ribbed 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.

10-20 cm long, 12-20 mm thick, with 12-20 nodes and 2 spikelets per node;

internodes 7-10 mm, densely hairy.

10-22 mm, with 3-7 florets.

13.5-25 mm, with 4-9 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.

8.5-16 mm long, 0.5-2.5 mm wide, stiff, keeled distally, the central portion thicker than the margins, tapering from below midlength to the subulate apices, hairy, 0-1(3)-veined, veins inconspicuous at midlength;

lower glumes 8.5-13.5 mm;

upper glumes 10-16 mm;

calluses poorly developed;

lemmas 10.5-15 mm, densely villous, hairs 2-3 mm, apices unawned or awned.

to 2 mm;

anthers 4.5-7 mm, dehiscent.

= 28.

= 28.