Flora of North America species comparison

15-60 cm, erect or spreading, bases bulbous.

10-30 cm.

closed for about 1/4 their length, terete, lowest sheaths with swollen bases;

ligules 1-3 mm, smooth or scabrous, apices obtuse to acute;

blades 1-2.5 mm wide, flat, thin, lax, soon withering.

closed for 1/7 – 1/6 their length, terete, bases of basal sheaths glabrous;

ligules 1.5-3 mm;

innovation blades similar to the cauline blades;

cauline blades 1-3 mm wide, involute, moderately thick, soft, abaxial surfaces smooth, adaxial surfaces smooth or sparsely scabrous, apices narrowly prow-shaped.

intravaginal.

intravaginal.

3-12 cm, ovoid;

nodes with 2-5 branches;

branches ascending to spreading, terete, usually smooth or sparsely scabrous, infrequently moderately scabrous.

3-6 cm, congested or moderately congested;

nodes with (1)2(3) branches;

branches 1-3(4) cm, erect, terete, smooth or sparsely scabrous.

3-5 mm, laterally compressed, usually bulbiferous;

florets 3-7, the basal floret, and sometimes additional florets, normal;

rachilla internodes smooth, glabrous.

5-7 mm, lengths to 3.5 times widths, broadly lanceolate, weakly laterally compressed, fairly drab;

florets 2-4;

rachilla internodes usually 1-1.3 mm, smooth.

keeled, keels scabrous;

lower glumes 3-veined;

upper glumes shorter than or subequal to the lowest lemmas;

calluses webbed or glabrous;

lemmas 3-4 mm, lanceolate, keeled, glabrous or the keels and marginal veins short- to long-villous, intercostal regions glabrous or softly puberulent, apices acute;

paleas scabrous, keels often softly puberulent at midlength;

anthers 1.2-1.5 mm and functional, sometimes aborted late in development, sometimes not developed.

lanceolate, distinctly keeled, keels smooth;

lower glumes 3-veined;

calluses glabrous;

lemmas 3-4.6 mm, lanceolate, distinctly to weakly keeled, evenly and densely strigulose over the proximal 1/3-1/2, hairs mostly about 0.1 mm, some keel hairs to 0.2(0.3) mm, lateral veins obscure, margins broadly scarious, glabrous, apices acute;

palea keels scabrous, softly puberulent at midlength, intercostal regions softly puberulent;

anthers 1.5-1.8 mm.

= 14, 21, 28, 39, 42, 45.

= unknown.