Flora of North America species comparison

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

(8)10-35 (50) cm, erect, smooth, glabrous or sparsely pubescent below 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 about 1/2 their length, glabrous or pilose, persistent;

collars glabrous;

ligules 0.1-0.5 mm;

blades 0.4-0.8(1) mm in diameter, conduplicate, sometimes glaucous, abaxial surfaces glabrous, pubescent, or pilose, all conditions often present on the same plant, adaxial surfaces scabrous or pubescent, veins 5-7, ribs 3, 1 distinct and 2 indistinct;

abaxial sclerenchyma in 3 strands, 2 at the margins and 1 opposite the midvein, strands as wide or wider than the veins;

adaxial sclerenchyma absent;

flag leaf blades 0.3-2 cm.

(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.

1.5-4(5.5) cm, panicles or racemes, contracted, with 1(2) branches per node;

branches erect, lower branches with 1-2 spikelets.

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

(5)7-9(11) mm, with (2)3-5(6) 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.

exceeded by the upper florets, ovate to lanceolate, glabrous, sometimes scabrous distally;

lower glumes 2.5-3.4 mm;

upper glumes 3-4.3 mm;

lemmas 4-5.5 mm, ovate to ovate-lanceolate, glabrous, sometimes scabrous towards the apices, awns 0.8-2.6(3) mm, terminal;

paleas about as long as the lemmas, intercostal region smooth or scabrous distally;

anthers (2)2.4-3.5 mm;

ovary apices glabrous.

= 28.

= 14.