Flora of North America species comparison

20-60 cm tall, about 1 mm thick, erect, internodes glabrous;

nodes 2-4, pubescent.

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

glabrous, smooth;

collars glabrous, without tufts of hair at the sides;

ligules 0.5-2.5 mm, glabrous, obtuse;

blades 15-45 cm long, 0.2-0.6 mm wide, convolute, stiff, 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.

8-25 cm, open, lax, sparse;

branches 2-6 cm, with 1-8 spikelets;

pedicels 3-12 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, 4-10 mm long, 0.9-1.2 mm wide, narrowly lanceolate, scabridulous, apices aristate;

florets 1.5-2.5 mm long, 0.7-0.9 mm wide, terete, widest near the top;

calluses 0.1-0.3 mm, acute, strigose, hairs reaching to midlength on the lemmas;

lemmas strongly tuberculate, particularly distally, mostly glabrous, narrowing abruptly to the crown, midveins pubescent proximally;

crowns about 0.5 mm long, about 0.2 mm wide, straight-sided, rims entire or irregularly lacerate, glabrous;

awns 15-35 mm, eccentric, straight to twice-geniculate;

anthers 3, 1-1.5 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 1.2 mm, oblong, dark brown.

4.5-5.5 mm.

= 36.

= 70.