Flora of North America species comparison

25-85 (100) cm, usually smooth, glabrous, occasionally scabrous below the inflorescences.

45-80 cm, erect or the bases decumbent, scabrous near the inflorescence.

closed for less than 1/2 their length, smooth or scabrous, rarely pilose, persistent;

collars glabrous;

ligules 0.2-0.6 mm;

blades (0.3)0.5-0.9(1.5) mm in diameter, conduplicate, abaxial surfaces smooth or scabrous, adaxial surfaces scabrous or pubescent, rarely pilose, often glaucous or bluish, veins (3)5(7), ribs (1)3-5, well defined;

abaxial sclerenchyma in 5-7 wide, irregular strands;

adaxial sclerenchyma absent.

closed for less than 1/3 their length, glabrous or finely scabrous;

collars glabrous;

ligules 3-5(8) mm;

blades 1-3 mm wide when flat, 0.6-1.2 mm in diameter when conduplicate, persistent, abaxial surfaces glabrous, smooth to sparsely scabrous, adaxial surfaces scabrous, veins (5)7-9, ribs 5-9;

abaxial sclerenchyma in strands opposite the veins, rarely a discontinuous band;

adaxial sclerenchyma sometimes present;

girders sometimes present at the major veins;

pillars usually present if the girders not developed.

(5)7-15(20) cm, loosely contracted or open, with 1-2 branches per node;

branches usually somewhat spreading at maturity, sometimes erect, rarely reflexed, lower branches with 2+ spikelets.

6-10(16) cm, contracted or loosely open, with 1-2(3) branches per node;

branches erect or spreading, lower branches sometimes reflexed, spikelets borne towards the ends of the branches.

(5.8) 7.5-13.5(19) mm, with (2)4-7(9) florets.

6-8.5 mm, with 2-3(4) florets.

exceeded by the upper florets, ovate-lanceolate to lanceolate, mostly smooth, sometimes scabrous distally;

lower glumes 2.4-5(6) mm;

upper glumes 3-6(8) mm;

lemmas 5-8.5(10) mm, scabrous at the apices, awns (1.5)3-6(7) mm, usually more than 1/2 as long as the lemma bodies;

paleas shorter than to about as long as the lemmas, intercostal region scabrous or puberulent distally;

anthers 2.4-4.5 mm;

ovary apices glabrous.

scabrous, acute;

lower glumes 3-4(5.5) mm;

upper glumes 3.5-5.5(6.5) mm;

lemmas 4-6.5 mm, ovate-lanceolate, glabrous, smooth or sparsely scabrous towards the apices, unawned;

paleas as long as to slightly longer than the lemmas, intercostal region puberulent distally;

anthers 1.5-2.6 mm;

ovary apices pubescent.

= 28.

= unknown.