Flora of North America species comparison

23-86 cm tall, 0.8-1.8 mm thick, bases often decumbent.

50-120 cm.

closed for 1/3 – 1/2 their length;

ligules 0.2-1.9(2.5) mm, smooth or obtuse;

blades (0.5)1-4 mm wide, flat or folded, thin.

closed for 1/2 - 3/4 their length, usually sparsely to moderately retrorsely scabrous, margins not ciliate;

ligules 2-3.5 mm, smooth or sparsely scabrous, obtuse to acute;

blades 3-8 mm wide, flat, lax, apices narrowly prow-shaped.

mainly pseudointravaginal.

extravaginal.

(5)8-20 cm, erect or lax, broadly pyramidal at maturity, open, sparse, lower axils sometimes sparsely pubescent;

nodes with 1-2(4) branches;

branches 5-12 cm, spreading to reflexed, straight, angled, angles scabrous, with 3-8 spikelets in the distal 1/4-1/3.

14-30 cm, open, sparse, with 1-3(4) branches per node;

branches (5.5)8-12(15) cm, widely spreading, fairly straight, angled, angles sparsely to moderately scabrous, with 3-13 spikelets.

3-8.2 mm, laterally compressed;

florets 2-4(6);

rachilla internodes smooth, sparsely softly puberulent.

4-8 mm, laterally compressed, rarely bulbiferous;

florets 2-4, usually normal, rarely bulb-forming;

rachilla internodes about 1 mm, smooth, glabrous.

distinctly shorter than the adjacent lemmas, distinctly keeled, keels scabrous;

lower glumes subulate to lanceolate, (1)3-veined;

upper glumes lanceolate to broadly lanceolate;

calluses usually glabrous, rarely sparsely and shortly webbed;

lemmas (2.8)3-4.6 mm, lanceolate, distinctly keeled, keels and marginal veins short- to long-villous, hairs extending up 3/4 of the keel, lateral veins prominent, intercostal regions softly puberulent, smooth, apices obtuse, blunt;

palea keels softly puberulent to short-villous for much of their length, apices scabrous;

anthers 1-1.4(2.6) mm.

distinctly keeled, keels scabrous;

lower glumes lanceolate, 1-3-veined;

upper glumes shorter than or subequal to the lowest lemmas;

calluses webbed;

lemmas 3.2-6 mm, lanceolate, distinctly keeled, smooth or sparsely finely scabrous, keels and marginal veins long-villous, keels hairy to 2/3 – 3/4 their length, marginal veins sparsely hairy, lateral veins moderately prominent, usually glabrous, rarely sparsely softly puberulent, intercostal regions glabrous, apices acute;

paleas scabrous, glabrous over the keels;

anthers 0.5-1.1 mm.

= 28.

= ca. 98.