Flora of North America species comparison

22-130 cm, erect;

nodes glabrous.

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

often mostly basal, sometimes more evenly distributed;

sheaths glabrous or pubescent;

auricles usually present on the lower leaves, 0.5-1.5 mm;

ligules 0.1-0.5 mm, erose, sometimes ciliolate;

blades 1.5-6 mm wide, generally involute, abaxial surfaces usually glabrous, adaxial surfaces strigose, ribs subequal in size and spacing.

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.

3.5-26 cm long, 0.5-1 cm wide, erect to slightly nodding, usually with 1 spikelet per node, sometimes with 2 at a few nodes;

internodes 3.5-15 mm long, 0.1-0.8 mm wide, glabrous or hairy.

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.

8-31 mm, 1.5-3 times longer than the internodes, appressed, with 3-11 florets;

rachillas glabrous or hairy, hairs to 1 mm;

disarticulation above the glumes, 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.

subequal, 5-14 mm long, 1/2 - 3/4 the length of the adjacent lemmas, 0.7-1.3 mm wide, lanceolate, glabrous or hairy, smooth or scabrous, 3-5-veined, flat or weakly, often asymmetrically keeled, keels straight, margins narrow, tapering from the base or from beyond midlength, apices acute to acuminate, sometimes mucronate or shortly awned;

lemmas 7-12 mm, glabrous or hairy, hairs all alike, sometimes scabrous, acute to awn-tipped, awns to 2 mm, straight;

paleas about equal to the lemmas, keels straight below the apices, smooth or scabrous proximally, sometimes hairy, scabrous distally, intercostal region glabrous or with hairs, apices 0.2-0.3 mm wide;

anthers (2.5)3-6 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.