Flora of North America species comparison

slender, wiry, glabrous, often with minute purple streaks and dots, ascending from a decumbent base, often branching extensively at the base and rooting at the lower nodes.

50-100 cm, erect, solitary or in small tufts from stout, scaly, creeping to vertical rhizomes or stolons, simple or branching at the base;

nodes densely villous.

usually shorter than the internodes, glabrous, margins short-ciliate;

ligules usually less than 0.3 mm, membranous, erose, ciliate;

blades 4-15 cm long (rarely longer), 2-3 mm wide, flat or slightly involute, glabrous on both surfaces, margins scabridulous, especially towards the apices, bases narrowed.

densely villous;

ligules membranous, ciliate, hairs 1.5-2 mm;

blades 20-60 cm long, 4-10 mm wide, ascending to spreading, strigose to subglabrous, flat basally, tapering to a long, involute point.

4-17 cm, 1/2 to nearly as wide as long;

branches few, capillary, ascending or spreading, scabridulous, with a few spikelets distally;

pedicels 0.5-10 mm.

20-30 cm long, 3-9 cm wide, narrow, shortly exserted;

branches slender, ascending;

secondary branches and pedicels 1-4 mm, crowded, ascending to appressed.

3.2-4 mm long, about 1.5 mm wide, broadly ellipsoid or obovoid, tuberculate, hispid, faintly veined, acute or acuminate at the apices.

5-7 mm, densely villous, hairs silvery or tawny-white.

usually less than 1 mm, obtuse or acute;

upper glumes and lower lemmas subequal, distinctly tuberculate, hispid, with stiff hairs arising from wartlike bases;

upper florets 2.7-3.2 mm long, 1.3-1.6 mm wide, obovoid or ellipsoid, nearly smooth, minutely papillose, or cross-rugulose, subacute to acute.

about 3/4 the length of the spikelets, 7-11-veined;

upper glumes and lower lemmas 7-15-veined;

lower florets staminate;

lower paleas about as long as the lower lemmas;

upper florets striate, margins of the upper lemmas villous, hairs white;

lodicules very large.

= unknown.

= 36.