Flora of North America species comparison

31-126 cm.

(15)30-80 cm, erect or the bases decumbent, terete or weakly compressed;

nodes terete, 1-3 exserted.

closed for 1/2 - 7/8 their length;

ligules 0.1-1.7(2.1) mm, smooth or sparsely scabrous, truncate to obtuse;

blades 0.8-4.1 mm wide, flat, lax.

closed for 1/2 - 9/10 their length, compressed, smooth, glabrous, bases of basal sheaths glabrous, distal sheath lengths 1-3 times blade lengths;

collars smooth, glabrous;

ligules 0.5-4 mm, smooth or sparsely scabrous, truncate to obtuse;

innovation blades similar to the cauline blades;

cauline blades 2-5 mm wide, flat, thin, smooth or sparsely scabrous mainly over the veins, apices broadly prow-shaped, middle and upper cauline blades subequal in length, flag leaf blades (2.5)4-7(11) cm long.

mainly pseudointravaginal.

all or mostly extravaginal.

11.4-36 cm, erect or lax, narrowly pyramidal, usually open, infrequently contracted;

nodes with (2)3-5(7) branches;

branches spreading, straight, angled, angles sparsely to moderately scabrous.

(5)12-22 cm, usually narrowly pyramidal, open, sparse, with 20-70 spikelets, proximal internodes usually (3.5)4+ cm, with 2-3(4) branches per node;

branches 3-8 cm, spreading to eventually reflexed, terete or weakly angled, sparsely to moderately scabrous, with 3-12 spikelets.

3.5-6.7 mm, laterally compressed;

florets 2-4;

rachilla internodes glabrous.

5-9 mm, lengths to 3.5 times widths, laterally compressed, not sexually dimorphic;

florets 2-6;

rachilla internodes smooth, glabrous, distal internodes 1+ mm.

ovate, distinctly keeled, keels scabrous;

lower glumes 1-veined;

upper glumes shorter than or subequal to the lowest lemmas;

calluses webbed;

lemmas 2.7-4.2(5) mm, lanceolate, distinctly keeled, keels short-villous to about midlength, marginal and lateral veins glabrous, lateral veins obscure or moderately prominent, intercostal regions glabrous, smooth, apices acute;

paleas glabrous or ciliolate over the keels, apices finely scabrous;

anthers 0.4-0.8 mm.

lanceolate, distinctly keeled;

lower glumes 1-3-veined;

calluses glabrous;

lemmas 3-6.5 mm, lanceolate, distinctly keeled, keels and marginal veins glabrous or short-villous to softly puberulent to 1/3 their length, lateral veins obscure, intercostal regions glabrous or sparsely hispidulous, rarely softly puberulent, smooth or sparsely finely scabrous, margins glabrous, apices acute;

palea keels scabrous, glabrous, intercostal regions glabrous;

anthers vestigial (0.1-0.2 mm) or (1.3)2-3.6 mm.

= unknown.

= unknown.