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, 0.4-0.7 mm thick, bases somewhat bulblike, erect, geniculate and often branching intra-vaginally at the lower cauline nodes, internodes glabrous;

nodes 5-8+, glabrous.

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.

mostly glabrous, throats sometimes ciliate;

collars sparsely hairy, with tufts of hair at the sides, hairs 0.5-1.3 mm;

ligules 0.2-0.3 mm, truncate, usually ciliate;

blades 3-10 cm long, 1-1.5 mm wide, strongly convolute, stiff, abaxial surfaces glabrous, adaxial surfaces with coarse hairs.

8-25 cm, open, lax, sparse;

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

pedicels 3-12 mm.

2-20 cm;

branches 0.4-1.2 cm, with 1-4 spikelets;

pedicels 0.5-4 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, 3-4.5 mm long, 1.1-1.6 mm wide, ovate, 3-veined, glabrous or puberulent, acuminate;

florets 1.6-2.2 mm long, 0.6-0.9 mm wide, obovate to oblong, terete, widest near the top;

calluses 0.2-0.3 mm, obtuse, glabrous;

lemmas glabrous, smooth, lustrous, transition to the crown not evident;

crowns about 0.1 mm long and wide, not differing in texture from the lemmas;

awns 7-10 mm, eccentric, rapidly deciduous;

anthers about 1 mm or 0.3-0.4 mm, florets with longer anthers presumably chasmogamous, those with shorter anthers presumably cleistogamous.

about 1.2 mm, oblong, dark brown.

about 1 mm.

= 36.

= 42.