Flora of North America species comparison

30-60 cm, slender.

40-120 cm, erect or ascending.

pilose-pubescent to nearly glabrous;

blades 7-28 cm long, 2-9 mm wide, pilose or glabrous.

10-20 cm long, 3-9 cm wide, erect, dense;

branches appressed to spreading, sometimes flexuous.

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

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

15-20 mm, elliptic to lanceolate, more or less terete, with 3-9 florets.

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.

glabrous, acuminate;

lower glumes 8-10 mm, 1-veined;

upper glumes 12-16 mm, 3(5)-veined;

lemmas 11-14 mm, lanceolate to linear-lanceolate, sparsely pubescent, 5-veined, rounded over the midvein, apices acuminate, bifid, teeth 2-3 mm, usually aristate, sometimes acuminate;

awns 13-20 mm, geniculate, strongly to moderately twisted in the basal portion, arising 1.5 mm or more below the lemma apices;

anthers 2-2.5 mm.

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.

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.

= unknown.

= 14, 28, 56.