Flora of North America species comparison

20-60(70) cm, erect or geniculate at the base;

nodes terete, usually 1-3 exserted.

50-120 cm, stout.

closed for 1/2-1/4 their length, usually compressed and keeled, usually smooth, infrequently scabrous;

ligules 2.5-7 mm, smooth or scabrous, usually decurrent, obtuse to acute;

blades 1.5-5 mm wide, usually flat, rarely folded, lax, soft, smooth or sparsely scabrous, margins scabrous, apices broadly prow-shaped, cauline blades 3-15 cm, flag leaf blades 1-4 cm.

closed for 1/2 - 3/4 their length, distinctly compressed, keels winged, bases of basal sheaths glabrous;

ligules 1-2 mm, smooth or sparsely scabrous, apices truncate;

blades (4)6-15 mm wide, flat or folded, apices broadly and abruptly prow-shaped.

both intra- and extravaginal.

extravaginal.

(5)10-15(25) cm long, 1/4-1/2 the plant height, usually erect, infrequently slightly nodding, usually eventually open, sometimes interrupted, sparse, with 1-3(5) branches per node;

branches initially erect and straight, usually some eventually spreading or reflexed, smooth or sparsely to moderately scabrous.

10-20 cm, ovoid to pyramidal, open, spikelets numerous, with 3-5 branches per node;

branches ascending to spreading, angled, angles densely scabrous.

(3)4-7 mm, laterally compressed;

florets 2-3(4);

rachilla internodes usually 1-1.2+ mm, smooth or sparsely scabrous, glabrous.

4-9 mm, laterally compressed;

florets 3-5;

rachilla internodes about 1 mm, scabrous, glabrous.

unequal, distinctly shorter than the adjacent lemmas, distinctly keeled, keels smooth or sparsely scabrous;

lower glumes 1-3-veined, 1/2 - 2/3 the length of the upper glume, 1/2 - 2/3 the length of the lowest lemmas;

upper glumes shorter than or subequal to the lowest lemmas;

calluses of some or all florets sparsely webbed;

lemmas 2.5-4 mm, lanceolate to narrowly lanceolate, distinctly keeled, smooth or scabrous throughout, glabrous, lateral veins obscure to moderately prominent, apices narrowly acute, usually anthocyanic near the tip;

palea keels sparsely scabrous;

anthers 3, 0.5-1(1.8) mm.

distinctly keeled, keels scabrous;

lower glumes 1-3-veined;

calluses glabrous;

lemmas 3.5-4.5 mm, narrowly lanceolate, distinctly keeled, scabrous, glabrous throughout, lateral veins prominent, apices acute;

palea keels scabrous, glabrous;

anthers 1.5-3 mm.

= 28.

= 14.