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.

30-100 cm tall, 1-2.2 mm thick, erect or geniculate at the basal nodes,

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.

usually glaucous;

sheaths mostly glabrous, throats ciliate;

collars mostly glabrous, with sparse tufts of hair at the sides, hairs 1-1.6 mm;

ligules 0.2-1.6 mm, glabrous, truncate to rounded;

blades 3-26 cm long, 0.4-1.2 mm wide, flat to convolute, abaxial surfaces scabridulous, adaxial surfaces hairy.

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

branches 2-8 cm, glabrous;

pedicels 1-11 mm.

15-80 cm, open, often partially enclosed at maturity;

branches 1-6 cm, flexuous or cernuous, with 1-8 spikelets on the distal 1/2;

pedicels 3-9 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.

glabrous, narrowly lanceolate, acuminate;

lower glumes 12-22 mm long, 0.9-1.7 mm wide;

upper glumes 3-4 mm shorter that the lower glumes;

florets 4-9 mm long, 0.6-0.8 mm wide, terete;

calluses 1.4-3.6 mm, sharp, strigose;

lemmas minutely papillose, tapering to the crown, the proximal 1/4 evenly pubescent, the distal 3/4 pubescent only over the veins;

crowns 0.2-0.5 mm long, 0.3-0.35 mm wide, straight-sided, rims with 0.8-1.1 mm hairs;

awns 50-110 mm long, 0.2-0.3 mm thick at the base, first geniculation evident, second geniculation obscure, terminal segment cernuous;

anthers 3.5-5.5 mm, penicillate.

about 2 mm, linear, dark brown.

4.5-5.5 mm.

= 40.

= 70.