Flora of North America species comparison

60-140 cm;

nodes glabrous or retrorsely pubescent.

54-135 cm, glabrous.

evenly distributed;

sheaths glabrous or pubescent;

auricles usually present, 0.5-2 mm;

ligules 0.3-3.5 mm, truncate to acute, sometimes long-ciliate;

blades 4-6.5 mm wide, flat or the margins involute, straight.

evenly distributed;

sheaths glabrous;

auricles absent or to 1 mm;

ligules 0.6-1 mm, truncate, erose;

blades 5-13 mm wide, flat to involute, abaxial surfaces smooth, glabrous, adaxial surfaces glabrous, veins closely spaced, all more or less equally prominent, smooth or scabrous.

15-31 cm long, 0.4-1.5 cm wide including the awns, 0.4-0.8 cm wide excluding the awns, erect, with 1 spikelet per node;

internodes 9-27 mm long, 1-1.3 mm wide, glabrous, smooth.

10-50 cm long, 0.8-1.8 cm wide, with 1 spikelet per node, glabrous below the spikelets;

internodes 5-8 mm long, about 0.2 mm thick, about 0.3 mm wide, both surfaces hairy, hairs 0.2-0.4 mm.

13-29 mm long, from shorter than to almost twice as long as the internodes, 2.5-5 mm wide, appressed, with 5-7 florets;

rachillas glabrous;

disarticulation above the glumes and beneath each floret.

15-27 mm, appressed to ascending, with 5-7 florets;

rachillas scabridulous;

disarticulation above the glumes, beneath the florets.

subequal, 7.5-12 mm long, 1.2-1.5 mm wide, lanceolate, widest at about mid-length, flat or rounded on the back, 5-veined, veins smooth, scabrous or just the midvein scabridulous, margins widest at about midlength, apices acute, unawned;

lemmas 9-12 mm, glabrous, sometimes scabrous, acute, unawned or awned, awns to 28 mm, straight;

paleas subequal to the lemmas, tapering, apices 0.2-0.3 mm wide;

anthers (3.5)4-7 mm.

equal, 5-11 mm long, 1.3-1.8 mm wide, stiff, lanceolate to linear-lanceolate, strongly rounded to keeled distally, keels inconspicuous and smooth on the proximal 1/3-1/2, conspicuous and with a few teeth distally, lateral veins inconspicuous, hyaline margins 0.1-0.2 mm wide, apices acuminate to awned, awns to 8 mm;

lemmas 7-12 mm, glabrous, smooth, apices unawned or awned, awns to 12 mm, straight;

paleas ciliate on the keels, apices about 0.6 mm wide;

anthers 4-7 mm.

= 28.

= 42.