Flora of North America species comparison

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

4-30 cm, usually erect, sometimes semi-prostrate, glabrous, smooth.

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 about 1/2 their length, glabrous, persistent;

collars glabrous;

ligules 0.1-0.3 mm;

blades (0.2)0.3-0.4(0.6) mm in diameter, conduplicate, lax, abaxial surfaces glabrous, adaxial surfaces sparsely scabrous to puberulent, veins 3-5, ribs 1-3;

abaxial sclerenchyma in 3-5 small strands, less than twice as wide as high;

adaxial sclerenchyma absent.

(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.

1-4(5) cm, contracted, with 1-2 branches per node;

branches erect, lower branches with 2+ spikelets.

9-13.5 mm, with 4-6 florets.

(2.5)3-5 mm, with (1)2-3(5) 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, ovate to ovate-lanceolate, sparsely scabrous distally;

lower glumes 1.3-2.5 mm;

upper glumes 2-3.5 mm;

lemmas (2)2.2-3.5(4) mm, ovate-lanceolate, sparsely scabrous near the apices, apices abruptly acuminate, awns 0.5-1.5(1.7) mm;

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

anthers (0.4)0.6-1.2 mm;

ovary apices usually with a few hairs, rarely glabrous.

leaf blades 0.7-3.5 cm.

= unknown.

= 28.