Flora of North America species comparison

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

35-75 cm tall, 1-2.5 mm thick, solitary or few together, glabrous or sparsely pubescent near 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, smooth;

auricles infrequently present, to 0.8 mm, the auricular location often with hairs to 2 mm;

ligules 0.3-0.5 mm, truncate, erose;

blades 4-29 cm long, 1-2(5) mm wide, flat, becoming involute when dry, stiff, adaxial surfaces scabrous, with scattered hairs to 2 mm, veins 7-11, 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.

1.5-27 cm long, 4-15 mm wide, with 1 spikelet per node at midspike, sometimes with 2 at the lower nodes;

internodes 7-20 mm, surfaces glabrous or strigillose, edges ciliate, cilia to 1 mm.

10-22 mm, with 3-7 florets.

16-25 mm, pedicellate, pedicels 1-2(5) mm, with 3-12 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.

subequal, 8-12 mm long, 0.5-1.5 mm wide, subulate, tapering from about 1/4 of their length, stiff, glabrous at least at the base, the central portion thicker than the margins, keeled, 0-1(3)-veined, veins inconspicuous at midlength;

lemmas 7-12 mm, glabrous, awned, awns 2.3-6.5(12) mm;

anthers 3.7-4.5 mm, dehiscent.

= 28.

= 28.