Flora of North America species comparison

40-80 cm, disarticulating at the nodes when mature.

10-50(70) cm, not disarticulating at maturity.

glabrous, rarely sparsely pilose, usually reddish above the nodes;

blades to 30 cm long, 2-4 mm wide, flexible but not curled at maturity, glabrous, sometimes scabrous, uppermost cauline blades erect to ascending.

usually glabrous;

blades 5-10 cm long, 1-3.5 mm wide, glabrous or slightly pilose.

with (4)6-17 spikelets;

branches usually flexible, usually divergent, sometimes strongly so, after anthesis;

lower branches with 2-3 spikelets;

pedicels on the lowest branch as long as or longer than the spikelets.

with (4)5-10 spikelets;

branches stiff, appressed or strongly ascending;

lower branches with (1)2-3(5) spikelets;

pedicels on the lowest branch shorter than the spikelets.

(7)10-16 mm.

11-15(19) mm.

1.7-2.6 mm long, 0.7-1.1 mm wide.

(2)2.3-3 mm long, 0.7-1.1 mm wide.

of middle florets about as long as wide, convex abaxially;

lemma bodies 2.5-5 mm, pilose over the back, sometimes sparsely so, margins pilose to beyond midlength, distal hairs 0.5-2 mm, apical teeth 2-4 mm, aristate, (1/2)2/3 or more as long as the lemma bodies;

awns 6-10 mm;

anthers to 2.2 mm.

of middle florets longer than wide, concave abaxially;

lemma bodies 3-6 mm, glabrous over the back, densely pilose along the margins, teeth 1.5-2.5 mm, acute to acuminate or aristate;

awns 6.5-8 mm;

anthers usually tiny, sometimes to 4 mm.

rarely produced.

= 36.

= 36, 98.