Flora of North America species comparison

10-60 cm.

5-30(40) cm tall, 0.3-0.7 mm thick, erect or the bases geniculate;

nodes terete, usually 1 exserted.

closed for 1/3 – 2/3 their length, terete, smooth;

ligules 1.5-3.5 mm, smooth or sparsely scabrous;

blades 1.5-4 mm wide, flat, thin, soft, apices broadly prow-shaped.

closed for 1/10 – 1/2 their length, terete or weakly compressed, smooth;

ligules 0.7-5 mm, decurrent, truncate to acute;

blades of innovations and culms similar, 2-5(8) cm long, 0.6-2.8 mm wide, flat or folded, thin, soft, smooth, margins scabrous, apices narrowly prow-shaped.

mixed intra- and extravaginal.

4-15 cm, nodding, open, with numerous spikelets and 1-2 branches per node;

branches (2)3-7 cm, spreading to reflexed, lower branches usually reflexed, flexuous, usually terete, smooth or sparsely scabrous, with (3)6-18 spikelets.

2-9.6 cm, erect, eventually open, moderately to densely congested, with 1-4(7) branches per node;

branches eventually ascending to spreading, rarely reflexed, terete, smooth or sparsely scabrous, spikelet-bearing to near the base or middle.

4-6 mm, lanceolate to broadly lanceolate, usually partly to wholly purplish, with 3-5 florets;

rachilla internodes shorter than 1 mm, smooth.

(2)2.4-4.5 mm, laterally compressed;

florets (1)2-6;

rachilla internodes usually shorter than 0.7 mm, smooth or scabrous, glabrous.

narrowly to broadly lanceolate, distinctly keeled, keels smooth or nearly so;

lower glumes 1-veined;

upper glumes shorter than or subequal to the lowest lemmas;

calluses webbed;

lemmas 2-3.5 mm, lanceolate, partly purple to fairly strongly purple, distinctly keeled, keels and marginal veins short- to long-villous, keels hairy for 2h-ls their length, lateral veins usually sparsely softly puberulent at least on 1 side, lateral veins obscure to moderately prominent, intercostal regions smooth, minutely bumpy, glabrous, apices acute, slightly bronze-colored or not;

palea keels scabrous, usually softly puberulent at midlength;

anthers 0.6-1 mm.

subequal, about 3/4 as long as to subequal to the adjacent lemmas, lanceolate, thin, distinctly keeled, keels scabrous;

lower glumes 1-3-veined;

calluses webbed;

lemmas 1.9-3 mm, broadly lanceolate, distinctly keeled, smooth, keels and marginal veins short- to long-villous, hairs on the keels extending to near the apices, lateral veins obscure, usually softly puberulent, intercostal regions usually sparsely softly puberulent, apices obtuse to acute;

palea keels softly puberulent to long-villous at midlength, scabrous near the apices;

anthers 1, 0.1-0.2(0.3) mm.

= 28.

= unknown.