Flora of North America species comparison

40-120 cm, erect or ascending.

50-100 cm, erect to spreading;

nodes 3-5, usually glabrous, rarely pubescent;

internodes glabrous.

usually glabrous, sometimes pubescent or pilose, especially the lower sheaths, midrib of the culm leaves usually narrowed just below the collar;

auricles absent;

ligules 1-3 mm, glabrous, truncate to obtuse, laciniate;

blades 10-20 cm long, 3-6 mm wide, flat, often glaucous, usually glabrous, sometimes scabrous, basal blades often pubescent.

7-16 cm long, 3-6 cm wide, open, erect to ascending;

branches sometimes longer than the spikelets, slender, ascending to spreading.

10-20 cm, open;

branches ascending and spreading or declining and drooping.

14-18(30) mm, oblong-lanceolate, terete to moderately laterally compressed, not purple-tinged;

florets 4-9(11), bases concealed or visible at maturity;

rachilla internodes 1.5-2 mm, concealed or visible at maturity.

15-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with (4)5-10 florets.

usually glabrous, sometimes scabrous or pubescent;

lower glumes 5-7 mm, 5-veined;

upper glumes 6-9 mm, 7(9)-veined;

lemmas 8-11.5 mm long, 1.7-2.6 mm wide, elliptic to lanceolate, coriaceous, backs usually glabrous, distinctly 7(9)-veined, not ribbed, rounded over the midvein, margins scabrous or pubescent, bluntly angled, inrolled or not at maturity, apices acute to obtuse, bifid, teeth shorter than 1 mm;

awns 3-10 mm, straight, arising less than 1.5 mm below the lemma apices, awn of the lowest lemma shorter than the others;

anthers 0.7-1.7 mm.

usually glabrous, rarely slightly pubescent, 3-veined;

lower glumes 5.5-8 mm;

upper glumes 6.5-9 mm, often mucronate;

lemmas 8-12 mm, elliptic to lanceolate, rounded over the midvein, backs pubescent or glabrous, margins usually with longer hairs, apices subulate to obtuse, entire;

awns 1.5-4 mm, straight, arising less than 1.5 mm below the lemma apices;

anthers 1.5-3.5 mm.

equaling or shorter than the paleas, weakly to strongly inrolled.

sheaths densely hairy, hairs stiff, often retrorse;

upper sheaths pubescent or glabrous;

ligules 1-2.5 mm, glabrous or pilose, obtuse, ciliolate;

blades 9-18 cm long, 2-4 mm wide, pilose on both surfaces.

= 14, 28, 56.

= 14.