Flora of North America species comparison

10-150 cm, slender, wiry, erect at first, ultimately decumbent, sprawling, glabrous, often with purple dots and streaks, branching extensively at the base, rooting at the lower nodes.

50-140 cm tall, 1.5-2.5 mm thick, usually erect, rarely decumbent, firm;

nodes glabrous or puberulent;

internodes glabrous.

often shorter than the internodes, loose, glabrous, margins short-ciliate;

ligules 0.2-0.5 mm, membranous, erose, ciliate;

blades 5-20 cm long, 3-10 mm wide, thin, flat, glabrous on both surfaces, margins scabridulous, apices long-acuminate.

shorter than the internodes, glabrous or hispid, hairs papillose-based, rounded basally;

ligules 0.5-2 mm;

blades 10-30 cm long, 2-8 mm wide, flat, glabrous or sparsely hirsute on 1 or both surfaces.

5-30 cm, nearly as wide as long;

branches few, capillary, with a few spikelets distally;

pedicels 0.5-10 mm.

4-25(40) cm long, 3-14 cm wide, exerted, lax;

primary branches 3-14 cm, opposite and alternate, ascending, glabrous, branching in the distal M;

pedicels 1-4 mm, appressed or spreading.

1.7-2.2 mm long, about 1 mm wide, ellipsoid or obovoid, glabrous, faintly veined, subacute or obtuse at the apices.

2.5-3.5 mm long, 1-1.2 mm wide, narrowly ovoid to ellipsoid, glabrous, acute.

0.3-0.8 mm, reduced, acute;

upper glumes and lower lemmas subequal or the glumes shorter, distinctly verrucose, with hemispheric warts;

upper florets 1.6-2 mm long, about 1 mm wide, grayish-brown, dull, minutely papillose, acute.

1-1.5 mm, about 1/3 as long as the spikelets, glabrous, 1-3-veined, acute;

upper glumes slightly exceeding the lower lemmas, glabrous, acute, scarcely separated from the lower lemmas;

lower florets staminate;

lower lemmas similar to the upper glumes;

lower paleas 2-3 mm, oblong;

upper florets 2-2.5 mm long, 0.8-1 mm wide, ellipsoid, widest below the middle, glabrous, smooth, shiny, apices lightly beaked.

= 36.

= 18, 36, 41, 42, 43, 45, 54, 63 (United States material apparently usually tetraploid, with 2n = 36).