Flora of North America species comparison

1-12 cm, slender.

20-80 cm, erect or the bases decumbent.

closed for 1/6 – 1/4 their length, terete;

ligules 1-3 mm, milky white to hyaline, smooth;

blades 0.5-2 mm wide, flat or folded, or slightly inrolled, thin, without papillae (at 100x), apices narrowly prow-shaped.

usually closed for about 1/6 their length;

ligules 1-4 mm, smooth or sparsely scabrous, apices obtuse to acute;

innovation blades 0.5-2 mm wide;

cauline blades 0.5-5 mm wide, flat, folded, abaxial surfaces smooth or scabrous, apices narrowly prow-shaped.

all or mainly intra-vaginal.

1-3 cm, erect, contracted, usually exserted from the sheaths;

branches to 1.5 cm, erect to steeply ascending, slender, sulcate or angled, smooth or the angles sparsely scabrous;

pedicels shorter than the spikelets.

5-15 cm, erect, usually contracted, sometimes interrupted;

branches shorter than 4 cm, erect, angles somewhat scabrous.

3-4 mm, laterally compressed, green or anthocyanic;

florets 2-3;

rachilla internodes shorter than 1 mm, smooth.

4-7 mm, weakly laterally compressed;

florets 2-5;

rachilla internodes smooth.

usually equaling or exceeding the lowest lemmas, sometimes also equaling or exceeding the upper florets, lanceolate to broadly lanceolate, distinctly keeled, keels smooth;

lower glumes 3-veined;

calluses glabrous;

lemmas 2.5-3 mm, lanceolate, distinctly keeled, thin, usually glabrous, keels and marginal veins rarely sparsely puberulent proximally, apices acute;

palea keels scabrous;

anthers 0.2-0.8 mm.

glumes 3-veined;

calluses glabrous or webbed, hairs to 1/4 the lemma length;

lemmas 2.5-4.5 mm, narrowly lanceolate, distinctly to weakly keeled, glabrous throughout or the keels and marginal veins sparsely long-villous, apices acute;

palea keels scabrous;

anthers aborted late in development or 1.3-2.2 mm.

= 14.

= 64.