Flora of North America species comparison

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

nodes glabrous.

50-100 cm.

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.

sometimes somewhat basally concentrated;

sheaths pilose or glabrous proximally;

auricles 0.3-1 mm;

ligules 0.25-1.5 mm;

blades 6-10 mm wide, usually flat, abaxial surfaces glabrous or sparsely pilose, adaxial surfaces usually sparsely pilose over the veins, sometimes glabrous, veins smooth, widely spaced, primary veins prominent, separated by the secondary veins.

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.

5-15 cm long, 0.5-1.5 cm wide, erect, usually with 1 spikelet per node, occasionally with 2 at a few nodes;

internodes 4-6(9.5) mm long, 0.5-1.2 mm wide, smooth or scabrous, glabrous, evenly puberulent, or sparsely pilose, hairs to 0.3 mm.

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.

10-27 mm, appressed to ascending, with 4-7 florets;

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.

oblong, glabrous, keeled distally, keels inconspicuous and smooth proximally, scabrous and conspicuous distally, lateral veins inconspicuous, hyaline margins present in the distal 1/2, apices acute, unawned or awned, awns to 3 mm;

lower glumes 8.8-11.4 mm, 3-6-veined;

upper glumes 7-12 mm, 5-7-veined;

lemmas 8-12 mm, glabrous, mostly smooth, sometimes scabridulous distally, unawned or with a 0.2-4(10) mm awn, awns straight;

paleas 7-9.5 mm, keels ciliate from 1/2 to almost the entire length, apices emarginate, truncate, or rounded;

anthers 4-7 mm.

= 28.

= 22, 42.