Flora of North America species comparison

(25)30-90(120) cm, glabrous or slightly scabrous;

nodes usually not exposed.

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

nodes usually not exposed.

closed for less than 1/3 their length, glabrous or scabrous, persistent, not shredding into fibers;

collars glabrous;

ligules 0.2-0.6 (1) mm;

blades deciduous, 2-4 mm wide, convolute, conduplicate, sometimes flat, 1-2.5 mm in diameter when conduplicate, yellow-green to dark green, abaxial surfaces scabrous, adaxial surfaces glabrous or pubescent, smooth or scabrous, veins 7-15(17), ribs 5-9;

abaxial sclerenchyma in strands about as wide as the adjacent veins;

adaxial sclerenchyma present;

girders associated with the 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.

5-16 cm, open, often secund, with 1-2(3) branches per node;

branches lax, spreading, lower branches usually recurved or reflexed, spikelets borne towards the ends of the branches.

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

branches erect to stiffly spreading.

8-14 mm, usually purple, lustrous, with 3-4(6) florets.

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

glabrous or slightly scabrous, distinctly shorter than the adjacent lemmas;

lower glumes 4-6.8(8.5) mm;

upper glumes (4.5)5.3-7.5(10) mm;

lemmas (6.5)7.5-9(12) mm, chartaceous, scabrous, at least on the veins, keeled on the lo'ver 1/2, veins 5, prominent, apices attenuate or short-awned, awns 0.2-0.7 mm;

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

anthers 2.6-4.5(5) mm;

ovary apices usually sparsely pubescent, rarely glabrous.

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.

= 28.

= 56.