Flora of North America species comparison

(35)50-90 (100) cm, erect, glabrous, smooth.

35-80 (100) cm, usually densely scabrous or densely pubescent below the inflorescences.

closed for less than 1/2 their length, glabrous, hirsute, or scabrous, persistent;

collars glabrous;

ligules 0.1-0.5 mm;

blades 0.5-1(1.2) mm in diameter, conduplicate, abaxial surfaces glabrous or puberulent, adaxial surfaces sometimes scabrous, glabrous or pubescent, veins (5)7-9, ribs 5-9, well defined;

abaxial sclerenchyma in 5-7 wide strands, sometimes confluent into a single band;

adaxial sclerenchyma absent.

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

collars glabrous, smooth or scabrous;

ligules 0.5-1.5(2) mm;

blades 0.3-0.8 mm in diameter, conduplicate, abaxial surfaces scabrous or puberulent, adaxial surfaces scabrous to pubescent, veins 5-7, ribs (1)3-5(7), distinct;

abaxial sclerenchyma in 5-7 broad strands, rarely forming a complete band, forming pillars with some veins;

adaxial sclerenchyma not developed.

(7)8-20(25) cm, loosely to densely contracted, with 1-2 branches per node;

branches erect to slightly spreading, lower branches with 2+ spikelets.

(4)6-15(20) cm, loosely contracted or open, with 1-2 branches per node;

branches erect or spreading, lower branches with 2+ spikelets.

9-13.5 mm, with 4-6 florets.

(6)8-16 mm, with (3)4-6(8) florets.

exceeded by the upper florets, ovate-lanceolate, smooth or scabrous distally;

lower glumes (2)2.5-5 mm;

upper glumes 4-6.2 mm;

lemmas 5-7(8.2) mm, scabrous near the apices, awns (2)3-5 mm, terminal, usually more than 1/2 as long as the lemma bodies;

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

anthers (2.6)2.8-3.6(4) mm;

ovary apices glabrous.

exceeded by the upper florets, lanceolate, glabrous, smooth or scabrous distally;

lower glumes (3)3.3-5.5 mm;

upper glumes 4.5-6.6(7) mm;

lemmas 5.5-9 mm, glabrous, smooth or scabrous towards the apices, unawned or awned, awns 0.4-2(3) mm;

paleas slightly shorter than the lemmas, intercostal region scabrous or puberulent distally;

anthers (2)3-4(4.2) mm;

ovary apices densely pubescent.

= unknown.

= 42.