Flora of North America species comparison

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

nodes 2-4, pubescent.

30-140 cm tall, 1-1.8 mm thick, erect or geniculate, internodes glabrous;

nodes usually 2-4, exposed, sericeous, hairs to 1.2 mm.

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.

glabrous or slightly hispid, basal leaf sheaths often with cleistogenes;

collars glabrous, often brown or purple-tinged, with tufts of hair at the sides, hairs 0.5-1.2 mm;

Iigules 1-4 mm, glabrous or pubescent, truncate;

blades to 30 cm long, 2-8 mm wide, flat to convolute, sometimes scabrous, sometimes with hairs.

8-25 cm, open, lax, sparse;

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

pedicels 3-12 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.

subequal, 10-22 mm long, 1.8-2.3 mm wide, narrowly lanceolate, glabrous, 3-5-veined;

florets 6-13 mm long, 1-1.5 mm wide, terete, widest just below the crown;

calluses 2-4.5 mm, sharp, strigose;

lemmas often purple, finely rugose-papillose, particularly near the crown, constricted below the crown, midveins pilose proximally, glabrous between the veins at maturity;

crowns 0.4-1.6 mm, usually wider than long, sides usually flaring somewhat distally, rims with hairs to 0.5 mm;

awns 50-120 mm, clearly twice-geniculate, terminal segment straight;

anthers 3-3.5 mm, penicillate.

about 1.2 mm, oblong, dark brown.

3-5 mm.

panicles 5-40 cm, exserted, erect to nodding;

branches 2.5-8.5 cm, with 2-5 spikelets;

pedicels 1-8 mm, angled, scabrous, pubescent.

= 36.

= 28.