Flora of North America species comparison

(10)30-130 cm, disarticulating at the nodes at maturity.

8-60 cm, usually erect, sometimes decumbent, not disarticulating.

glabrous or pilose, upper sheaths usually glabrous or unevenly pilose;

blades 10-30 cm long, (1)2-5(6) mm wide, flat to rolled or involute, glabrous or pilose, uppermost cauline blades strongly divergent to reflexed at maturity.

glabrous or pilose;

blades 5-15 cm long, 0.5-4 mm wide, usually flat, glabrous or sparsely pilose.

usually racemose, with (2)3-6(10) widely-spreading spikelets;

branches flexible, strongly divergent to reflexed at maturity, pulvini usually present at the base;

pedicels on the lowest branch longer than the spikelets, often crinkled.

with up to 15 spikelets;

branches erect;

lower branches with 1-3 spikelets.

(10)14-26(30) mm.

6-15 mm;

florets usually cleistogamous, rarely chasmogamous.

2.5-4.2 mm long, 1.3-1.6 mm wide.

2.1-2.5 mm long, 1.1-1.8 mm wide.

of middle florets usually longer than wide, concave abaxially;

lemma bodies 5-10 mm, glabrous or sparsely pilose over the back, margins pubescent (rarely glabrous), apical teeth (2)4-6(7) mm, aristate;

awns (7)8-12 mm;

anthers to 4 mm.

of middle florets from as long as to a little longer than wide, convex abaxially;

lemma bodies 5-6 mm, margins glabrous or pubescent for most of their length, scabrous apically, apices with acute teeth, teeth often scabrous, sometimes scabridulous, mucronate, not awned, from between the teeth;

palea veins swollen at the base, forming pulvini;

anthers of the cleistogamous florets 0.2-0.4 mm, those of the chasmogamous florets about 2 mm.

= 36.

= 24, 36, 124.