Flora of North America species comparison

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

18-105 cm tall, 2-3 mm thick.

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, often most densely hairy in the collar region;

auricles to 1.4 mm;

ligules 0.1-0.5 mm;

blades 2-6 mm wide, involute, abaxial surfaces scabridulous or smooth, adaxial surfaces scabrous, occasionally with scattered hairs to 1.5 mm, veins unequal, not crowded.

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.

3-16 cm long, 8-20 mm thick, erect, usually well exserted, with 2-3 spikelets per node;

internodes 4-6 mm, hairy throughout, edges with hairs to 2.5 mm.

10-22 mm, with 3-7 florets.

10-18 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.

often unequal, sometimes absent, 2.5-12 mm long, 0.5-1 mm wide, hairy, stiff, keeled, the central portion thicker than the margins, bases not overlapping, tapering from near the base to the subulate apices, 0-1(3)-veined, veins inconspicuous at mid-length;

calluses hairy;

lemmas 7-12 mm, usually conspicuously villous or velutinous, occasionally glabrate, hairs 0.7-2.5 mm, awned, awns 2-4 mm;

anthers 3.5-10 mm, dehiscent.

= 28.

= 28, 56.