Flora of North America species comparison

1-12 cm, slender.

30-90 cm, slender to coarse.

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 1/20 – 1/10 their length, terete, scabrous, glabrous;

collars smooth to scabrous;

ligules 0.5-4(6) mm, scabrous, apices truncate to acute, entire or lacerate;

innovation blades 15-30 cm;

cauline blades 1-4 mm wide, involute or rarely flat, moderately thick and firm, both surfaces sparsely to densely antrorsely scabrous, apices narrowly prow-shaped, flag leaf blades usually longer than their sheaths.

all or mainly intra-vaginal.

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.

(7)10-30 cm, erect, pyramidal, open, with 2-5 branches per node;

branches 2-8(15) cm, spreading, straight, angled, angles moderately to densely scabrous, sometimes densely scabrous all over, with 10-30 spikelets.

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

florets 2-3;

rachilla internodes shorter than 1 mm, smooth.

4-7 mm, lanceolate, laterally compressed;

florets 2-5;

rachilla internodes 0.8-1.5 mm, smooth or scabrous, sometimes sparsely hispidulous.

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.

sparsely to rarely densely scabrous;

lower glumes 1-3-veined;

calluses usually glabrous, rarely sparsely short-webbed;

lemmas 2.5-3.5 mm, lanceolate, distinctly keeled, smooth or sparsely to densely scabrous, keels and marginal veins glabrous or softly puberulent or short- to long-villous, lateral veins moderately prominent to prominent, intercostal regions usually glabrous, infrequently sparsely softly puberulent, apices acute;

palea keels scabrous;

anthers aborted late in development, or 2.2-2.5 mm.

= 14.

= 28+1, 28-29+11.