Flora of North America species comparison

60-140 cm;

nodes glabrous or retrorsely pubescent.

18-75 cm, often decumbent or geniculate;

nodes usually glabrous.

glabrous;

auricles about 0.5 mm;

ligules 0.5-1 mm, truncate;

blades 3-4 mm wide, flat, glabrous or hairy, abaxial surfaces less densely hairy and with shorter hairs than the adaxial surfaces, apices acute.

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.

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.

5-12 cm long, 0.4-0.7 cm wide excluding the awns, erect, with 1 spikelet per node;

internodes 4-5.5 mm, edges ciliate.

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.

11-19 mm, appressed, with (3)4-5 florets;

rachillas hairy, hairs about 0.4 mm;

disarticulation above the glumes, beneath each floret.

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.

8-12 mm long, 1.2-2 mm wide, about 3/4 as long as to equaling the adjacent lemmas, narrowly ovate to obovate, often purplish, glabrous, sometimes scabrous, flat or equally keeled the full length, keels and other veins usually smooth, sometimes scabrous, 3(5)-veined, adaxial surfaces glabrous, margins usually unequal, the wider margin 0.3-1 mm wide, usually widest in the distal 1/3, apices acute to rounded, often awned, awns to 2 mm;

lemmas glabrous or pubescent, hairs flexible, all similar, apices usually awned, awns 0.5-3 mm, straight;

paleas subequal to the lemmas, tapering to the apices, apices about 0.4 mm wide;

anthers 0.7-1.3 mm.

StH.

= 28.

= 28.