Flora of North America species comparison

1-12 cm, slender.

15-50 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.

closed for 1/4-1/2 their length, terete;

ligules acute;

blades flat, thin, apices broadly prow-shaped.

all or mainly intra-vaginal.

intra- and extravaginal.

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.

erect, narrowly lanceoloid to ovoid, contracted, with 2-4 branches per node;

branches ascending to spreading, sparsely scabrous.

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

florets 2-3;

rachilla internodes shorter than 1 mm, smooth.

3.5-6 mm, laterally compressed, with 3-4 florets.

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.

broadly lanceolate, distinctly keeled, distinctly scabrous on the distal 1/3;

lower glumes 3-veined;

calluses shortly webbed;

lemmas 2.5-4.5 mm, broadly lanceolate, keeled, keels and marginal veins long-villous, intercostal regions sofdy puberulent;

palea keels scabrous, long-villous at midlength;

anthers 1.2-1.4 mm.

= 14.

= unknown.