Flora of North America species comparison

25-100 cm tall, 0.4-0.7(1.1) mm thick, usually erect, basal nodes sometimes geniculate, internodes mostly glabrous, pubescent just below the lower nodes;

nodes 2-4, glabrous.

35-100 cm tall, 1.8-3.1 mm thick, erect or geniculate at the lowest nodes, sometimes scabrous below the panicles, internodes mostly glabrous, lower internodes sometimes pubescent below the nodes;

nodes 2-3, pubescent.

glabrous, even on the margins, sometimes scabridulous;

collars glabrous, without tufts of hair at the sides;

ligules 1-5 mm, glabrous, acute;

blades 7-60 cm long, 0.2-1.5 mm wide, usually convolute, stiff, glabrous, scabridulous.

glabrous or hairy, sometimes mostly glabrous, sometimes the distal margins ciliate, varying within a plant;

collars with tufts of hair at the sides, hairs 0.5-0.8 mm;

ligules 0.3-1.2 mm, glabrous, truncate to rounded;

blades 10-20 cm long, 0.8-3.5 mm wide, flat to convolute, abaxial surfaces glabrous or sparsely pilose.

8-50 cm, loosely contracted, often partly enclosed at maturity;

branches 2-8 cm, glabrous;

pedicels 1-11 mm.

18-60 cm, open;

branches 3-9 cm, spreading, flexuous, often pilose at the axils, with 2-6 spikelets;

pedicels 3-10 mm.

subequal, 5-13 mm long, 0.5-1.2 mm wide, narrowly lanceolate, glabrous, aristate;

florets (1.5)2.5-3 mm long, about 0.5 mm wide, widest at about midlength, somewhat laterally compressed;

calluses 0.2-0.5 mm, blunt, strigose, hairs reaching to about 1/4 - 1/3 the length of the lemmas;

lemmas finely tuberculate, rounded to the crown, midveins pubescent on the proximal 1/2;

crowns 0.1-0.2 mm long, 0.2-0.25 mm wide, straight-sided, rims with hairs shorter than 0.5 mm;

awns 45-100 mm, almost centric, cernuous throughout, twice-geniculate, usually both geniculations obscure;

anthers 3, 1.2-1.5 mm.

subequal, 12-20 mm long, 1.1-2.2 mm wide, narrowly lanceolate, glabrous;

florets 7.5-11.5 mm long, about 1.2 mm thick, terete;

calluses 1.8-3.5 mm, sharp, strigose;

lemmas papillose, evenly pubescent at maturity, constricted below the crown;

crowns 0.6-1.1 mm long, 0.5-0.7 mm wide, straight-sided to slightly flared, rims with 0.8-0.9 mm hairs;

awns 38-100 mm long, 0.3-0.45 mm thick at the base, strongly twice-geniculate, terminal segment straight;

anthers 3.5-5.5 mm, penicillate.

about 2 mm, linear, dark brown.

4.5-6 mm.

= 40.

= 64.