Flora of North America species comparison

50-100 cm, glabrous, somewhat glaucous;

nodes usually exposed.

60-100 (150) cm, erect, glabrous;

nodes usually exposed.

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

ligules 0.5-1 mm;

blades 2-10 mm wide, flat, loosely conduplicate, or involute, abaxial surfaces smooth or scabrous, glabrous or puberulent, adaxial surfaces smooth or scabrous, veins 13-35, ribs obscure;

sclerenchyma in abaxial and adaxial strands;

girders formed at most major veins.

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

ligules 0.3-1.5 mm;

blades 3-6(10) mm wide, flat, lax, margins scabrous, abaxial and adaxial surfaces glabrous, adaxial surfaces sometimes scabrous, veins 13-25, ribs obscure;

abaxial sclerenchyma in narrow strands;

adaxial sclerenchyma developed;

girders or pillars formed at the major veins.

(8)10-30(40) cm, open, with 1-2 branches per node;

branches lax, spreading, spikelets borne towards the ends of branches.

10-20(40) cm, open or somewhat contracted, with 1-2(3) branches per node;

branches lax, more or less spreading, spikelets borne towards the ends of the branches.

6-11 mm, sometimes glaucous, with (2)3-5 florets.

7-12 mm, with (2)3-5 florets.

lanceolate, smooth or scabrous, acuminate;

lower glumes 4-7 mm;

upper glumes 5-7.5 mm;

lemmas 5-8 mm, chartaceous, lanceolate, glabrous, usually smooth, sometimes scabrous towards the apices, apices acute to acuminate, unawned, sometimes mucronate;

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

anthers 2-3 mm;

ovary apices densely pubescent.

lanceolate, scabrous at least on the midvein, acute to acuminate;

lower glumes (1.5) 2.5-4(4.5) mm;

upper glumes (3)4-6.5 mm;

calluses wider than long, glabrous, smooth or slightly scabrous;

lemmas (5)6-8(9) mm, lanceolate, scabrous or puberulent, acuminate, unawned or awned, awns to 2 mm;

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

anthers 1.6-2.5 mm;

ovary apices pubescent.

= unknown.

= unknown.