Flora of North America species comparison

50-100 cm, glabrous, somewhat glaucous;

nodes usually exposed.

(30)40-90(140) cm, scabrous near the inflorescence;

nodes usually not 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, persistent;

collars glabrous;

ligules 0.1-0.5 mm;

blades 0.8-2 mm in diameter, usually conduplicate, rarely convolute, gray-green, deciduous, abaxial surfaces scabrous, adaxial surfaces scabrous or puberulent, veins (8)11-15(17), ribs (6)7-11;

abaxial sclerenchyma usually forming a more or less continuous band;

adaxial sclerenchyma developed;

girders at the 5-7 major veins;

pillars at some of the other veins.

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

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

(5)9-18(25) cm, open or loosely contracted, with (1)2(3) branches per node;

branches erect to stiffly spreading.

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

8-13(16) mm, with (3)4-5(7) 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.

exceeded by the distal florets;

lower glumes 4.5-7.5(8.5) mm, shorter than or about equaling the adjacent lemmas;

upper glumes 5.3-8.2(9) mm;

lemmas (6.2)7-8.5(10) mm, chartaceous to somewhat coriaceous, scabrous, backs rounded below the middle, veins more or less obscure, apices mucronate or shortly awned, awns to 1.5 mm;

paleas somewhat shorter than the lemmas, intercostal region puberulent distally;

anthers (3.3) 4.5-6 mm;

ovary apices pubescent.

= unknown.

= 56.