Flora of North America species comparison

15-35(55) cm, prostrate to strongly decumbent, at least at the base;

nodes glabrous.

35-100 cm, ascending to erect;

nodes sometimes pubescent.

glabrous or shortly pilose;

auricles usually present, 0.5-1 mm;

ligules 0.2-0.4(0.7) mm, usually truncate, occasionally acute, entire to erose;

blades 1.5-4 mm wide, usually involute, adaxial surfaces prominently ribbed.

glabrous;

auricles absent;

ligules 0.5-1 mm, truncate to rounded;

blades 3-10 mm wide, flat, usually glabrous, abaxial surfaces smooth or scabridulous, adaxial surfaces scabrous.

3.5-10 cm long, 0.8-1.2 cm wide excluding the awns, 3-6 cm wide including the awns, usually with 1 spikelet per node, occasionally with 2 spikelets at the lower nodes;

internodes 2.5-5(7) mm long, 0.5-1 mm wide, glabrous, mostly smooth, edges scabrous.

5-20 cm long, 0.4-0.8 cm wide, erect, with 1 spikelet per node;

internodes 7-8 mm long, about 0.5 mm wide, glabrous below the spikelets.

9-15 mm long, 6-12 mm wide, appressed to ascending, with 3-6 florets;

rachilla internodes 0.8-1.3 mm, scabridulous;

disarticulation initially at the rachis nodes, subsequently beneath each floret.

12-20 mm, appressed, with 4-7 florets;

rachillas hairy, hairs 0.3-0.5 mm;

disarticulation above the glumes, beneath each floret.

4-9 mm long, 0.5-1 mm wide, mostly glabrous, midveins scabrous, 3-5-veined, entire, tapering into a divergent, 12-30 mm awn;

lemmas 7-10 mm, usually glabrous, occasionally scabridulous, awned, awns 15-30 mm, divergent, scabridulous;

paleas usually longer than the lemmas, apices ciliate, truncate or the veins extending into teeth, teeth about 0.5 mm;

anthers 1-1.6 mm.

6-10 mm long, 1/3-2/3 the length of the spikelets and to about 1/2 the length of the adjacent lemmas, 0.8-1.8 mm wide, widest at about midlength, lanceolate, flat, rounded, or symmetrically keeled, usually green or green tinged with purple, 3-4-veined, veins scabridulous, scabrous, or with hairs to 0.3 mm, usually glabrous elsewhere, margins subequal, about 0.3 mm wide, widest near midlength, apices acute, unawned or awned, awns to 1 mm;

lemmas 8-12 mm, hairy throughout or glabrous distally, hairs all alike, 0.2-0.3 mm, apices unawned or awned, awns to 7 mm, straight;

paleas subequal to the lemmas, tapering to the apices, apices about 0.8 mm wide;

anthers 1-2 mm.

= 28.

= 28.