Flora of North America species comparison

50-120 cm, glabrous.

(15)20-75 (80) cm, smooth, glabrous or with sparse hairs.

closed for less than 1/3 their length, glabrous, shredding into fibers;

Iigules (0.2)0.5-1.5 mm;

blades 2-8 mm wide, flat or loosely convolute, smooth or scabrous, veins 9-35, ribs obscure;

abaxial sclerenchyma in narrow strands;

adaxial sclerenchyma developed;

girders or pillars usually associated with the major veins.

closed for less than 1/3 their length, usually glabrous, rarely pubescent, persistent;

collars glabrous;

ligules 0.1-0.5 mm;

blades (0.5)0.8-1.2 mm in diameter, usually conduplicate, rarely flat, abaxial surfaces glabrous, puberulent, or scabrous, adaxial surfaces scabrous or puberulent to pubescent, veins 5-7(9), ribs 3-7, usually distinct;

abaxial sclerenchyma usually in an irregular, interrupted or continuous band, rarely in 5-7 small strands, usually more than twice as wide as high;

adaxial sclerenchyma absent.

(5)10-20 cm, open, with 1-2 branches per node;

branches lax, ascending to spreading, spikelets clustered towards the ends of the branches, closely imbricate.

(2.5)3-13(16) cm, contracted, with 1-2 branches per node;

branches erect or stiffly spreading, secondary branches not divaricate, lower branches with 2+ spikelets.

4-7(7.5) mm, elliptic to obovate, with 3-5(8) florets.

5-9(10.8) mm, with 3-7(8) florets.

lanceolate to ovate-lanceolate, scabrous at least on the veins;

lower glumes (2.5)3-4(5) mm, usually almost as long as the adjacent lemmas;

upper glumes (3.5)4-5(5.5) mm;

lemmas 4-5(5.2) mm, stiffly chartaceous, ovate to obovate, glabrous, somewhat acute, unawned;

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

anthers (0.7)1-2(2.5) mm;

ovary apices pubescent.

exceeded by the upper florets, ovate-lanceolate to lanceolate, mostly smooth and glabrous, sometimes scabrous and/or pubescent distally;

lower glumes (1.8)2-3.5(4) mm;

upper glumes 3-5(5.5) mm;

lemmas 3.8-5(6.5) mm, lanceolate, usually smooth and glabrous on the lower portion and scabrous or pubescent distally, especially on the margins, rarely entirely pubescent, awns 0.5-2.5(3) mm, usually less than 1/2 as long as the lemma body;

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

anthers (1.8)2.3-3.4 mm;

ovary apices glabrous.

= unknown.

= 42.