Flora of North America species comparison

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

nodes glabrous.

30-130 cm, erect or geniculate, usually hairy on or below the nodes.

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.

evenly distributed;

sheaths glabrous;

auricles to 1.5 mm;

ligules 0.2-1.5 mm;

blades 10-30 cm long, 4-10 mm wide, flat, both surfaces scabrous, adaxial surfaces sometimes with hairs over the veins, hairs to 0.5 mm, veins not prominent, widely spaced.

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, 0.5-1.5 cm wide including the awns, 5-8 mm wide excluding the awns, erect or arching, with 1 spikelet per node;

internodes 4.5-7 mm, edges scabrous or ciliate, both surfaces hairy 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.

10-15(20) mm long, 2-5(7) mm wide, appressed to slightly divergent, with 2-6 florets;

rachillas scabridulous or pubescent, often more densely pubescent distally;

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.

equal to unequal, 0.6-1 mm wide, lanceolate to narrowly ovate, usually green, flat or weakly keeled, keels eccentric, adaxial surfaces hairy, hairs often inconspicuous, hyaline margins sometimes widest distally, narrowing abruptly to the acute to acuminate apices;

lower glumes 8-11 mm, 3-veined, usually awned, awns to 3 mm;

upper glumes 10-13 mm, 3-5-veined, sometimes awn-tipped, awns to 0.3 mm;

lemmas 9-13 mm, glabrous, smooth to somewhat scabridulous distally, rounded on the back proximally, awned, awns 7-20 mm, straight or flexuous;

paleas subequal to the lemmas, keels finely and densely ciliate over most of their length, straight or slightly outwardly curved, tapering to the apices, apices about 0.2 mm wide;

anthers 2-3 mm.

StH.

= 28.

= 28.