Flora of North America species comparison

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

nodes terete, usually 1-3 exserted.

20-80 cm.

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 at least 9/10 their length;

ligules 0.5-2 mm, smooth, truncate;

blades 1.5-5 mm wide, flat, lax.

both intra- and extravaginal.

mainly pseudointravaginal.

(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.

6-22 cm, lax, narrowly lanceoloid, sparse;

nodes with 1-3 branches;

branches ascending, lax, angled, angles scabrous.

(3)4-7 mm, laterally compressed;

florets 2-3(4);

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

3.5-7 mm laterally compressed;

florets (1)2(4);

rachilla internodes about 1 mm, smooth, 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-veined;

upper glumes shorter than or subequal to the lowest lemmas;

calluses webbed, webs sparse;

lemmas 3.2-5 mm, narrowly lanceolate, distinctly keeled, glabrous, acuminate;

palea keels scabrous, sometimes sparsely so;

anthers 0.5-1.2 mm.

= 28.

= unknown.