Flora of North America species comparison

(10)20-92 cm tall, 1.5-2.5 mm thick, ascending to erect from a decumbent, branching base.

50-100 (150) cm tall, 3-8 mm thick, spongy, erect to decumbent and rooting at the lower nodes.

glabrous, keeled;

ligules 4-9 mm;

blades (2)3-12 cm long, 4-8 mm wide, adaxial surfaces not papillose, apices abruptly acute.

finely scabridulous, not or weakly keeled;

ligules 4.5-12 mm, lacerate;

blades 12-30 cm long, 3.5-11 mm wide, both surfaces sometimes scabridulous, adaxial surfaces sometimes sparsely papillose.

6-30 cm long, 1-2.5 cm wide;

branches 1.5-9.5 cm, ascending, with 1-5 spikelets;

pedicels 1-2.5 mm.

20-40 cm long, 2.5-8 cm wide;

branches 4.2-14.7 cm, appressed to ascending, with 3-8(10) spikelets;

pedicels 2-5 mm, scabrous.

11-24 mm long, 1.3-3 mm wide, cylindrical and terete, except slightly laterally compressed at anthesis, rectangular in side view, with 8-15 florets.

9-20 mm long, 0.4-3 mm wide, cylindrical and terete, except at anthesis when slightly laterally compressed, rectangular in side view, with 6-15 florets.

oval;

lower glumes 1.4-3.5 mm;

upper glumes 2.5-4.9 mm;

rachilla internodes 1.2-1.8 mm;

lemmas (3.5)4-6 mm, 7-veined, veins and intercostal regions scabridulous, prickles about 0.05 mm, midveins extending to within 0.1 mm of the apical margins, apices acute, with a well-developed lobe on one or both sides opposite the lateral veins, entire to crenulate between the lateral lobes;

paleas exceeding the lemmas by 0.2-1(1.5) mm, keels winged, apices bifid, teeth 0.3-0.5 mm;

anthers 0.5-1.4 mm, usually purple.

broadly rounded to acute;

lower glumes 0.6-2.1 mm;

upper glumes 1.4-3.4 mm;

rachilla internodes 1-1.5 mm;

lemmas 2.6-4.5 mm, somewhat indented below the apical margins at maturity, veins raised, scabridulous to scabrous over and between the veins, prickles about 0.05 mm, midveins extending to within 0.1 mm of the apical margins, apices truncate to obtuse, crenulate;

paleas shorter than or equaling the lemmas, keels winged, tips parallel, intercostal region truncate or rounded, sometimes exceeding the keel tips;

anthers 3, 0.3-0.9 mm.

1.8-2.5 mm.

= 20.

= 40.