Flora of North America species comparison

(45) 60-100(120) cm, glabrous, smooth or scabrous below the inflorescence.

(40) 50-100(150) cm, glabrous, erect or decumbent at the base.

closed for less than 1/3 their length, smooth or scabrous, persistent;

collars glabrous;

ligules 2-5(9) mm, entire or lacerate, not ciliate;

blades 1.5-3 mm wide, 0.8-1.8 mm in diameter when conduplicate, deciduous, abaxial surfaces scabrous, adaxial surfaces scabrous or pubescent, veins 9-15, ribs 7-13;

abaxial sclerenchyma a more or less continuous band;

adaxial sclerenchyma present;

girders usually formed at the major veins, sometimes only pillars present.

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

ligules (0.2)0.5-1(2) mm;

blades (3)5-10 mm wide, flat or loosely convolute, glabrous or sparsely pilose, smooth or scabrous, veins (11)15-39, ribs obscure;

abaxial sclerenchyma in narrow strands;

adaxial sclerenchyma developed;

girders or pillars usually associated with the major veins.

(7)10-15(17) cm, open, with 1-2(3) branches per node;

branches 4.5-9 cm, lax, erect or spreading, spikelets borne towards the ends of the branches.

13-25 cm, open, with 1-2(3) branches per node;

branches lax, usually reflexed, sometimes spreading, spikelets borne towards the ends of the branches, not or only slightly imbricate.

(8)10-14 mm, with (3)4-5(6) florets.

4-5(7) mm, elliptic to ovate, with 2-4(6) florets.

unequal to subequal, ovate-lanceolate, scabrous or smooth, acute;

lower glumes (2)3.5-5.5 mm;

upper glumes (2.5)4.5-6.5(7) mm;

lemmas 6-10 mm, lanceolate to ovate-lanceolate, scabrous or smooth, unawned, sometimes mucronate, mucros to 0.2 mm;

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

anthers 3-4.5 mm;

ovary apices densely pubescent.

ovate-lanceolate, scabrous on the veins and distal margins;

lower glumes 2.5-3.5 mm, usually distinctly shorter than the adjacent lemmas;

upper glumes 3-4(4.7) mm;

lemmas 3-4.5 mm, ovate-lanceolate to ovate, stiffly chartaceous, glabrous, obtuse or somewhat acute, unawned;

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

anthers (0.8)1-1.7(2.2) mm;

ovary apices pubescent.

= 28, 42.

= 42.