Panicum brachyanthum
Panicum hemitomon
prairie panicgrass
maidencane, mountain panic
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.
50-200 cm, mostly erect and sterile, glabrous, often rooting from the lower nodes if submerged.
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.
usually glabrous, or pilose or hirsute at the lowermost sheath, especially distally;
ligules shorter than 1 mm;
blades 8-35 cm long, 5-15 mm wide, ascending or spreading, abaxial surfaces glabrous, adaxial surfaces usually scabridulous or pubescent, bases slightly narrowed, margins scabrous, apices long-tapering.
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.
10-30 cm long, less than 1 cm wide;
branches mostly short, appressed-ascending, with fascicles of congested spikelets; ultimate branchlets 1-sided;
pedicels 0.2-1.8 mm.
3.2-4 mm long, about 1.5 mm wide, broadly ellipsoid or obovoid, tuberculate, hispid, faintly veined, acute or acuminate at the apices.
2-2.8 mm, subsessile, lanceoloid, slightly laterally compressed, glabrous, acute.
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 1/2 as long as the spikelets, slightly keeled along the midveins, 3-veined, acute;
upper glumes and lower lemmas similar, glumes slightly shorter than the lemmas, faintly keeled on the back, acute;
lower florets staminate;
lower paleas subequal to the lower lemmas;
upper florets 2-2.5 mm, 2/5 to almost as long as the spikelets, narrowly ellipsoid;
upper lemmas relatively thin, flexible, pale, acuminate, clasping the paleas only at the base.
= unknown.
= 36, 40.
Panicum brachyanthum
Panicum hemitomon
Panicum brachyanthum grows in dry, sandy or clayey soils of open areas, remnant prairies, woodland borders, and roadsides and, less commonly, along the margins of bogs and on grassy shores in the western portion of the gulf coast plain. It is restricted to the southern United States. It resembles P. verrucosum in its growth habit, but is more restricted in its distribution.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Panicum hemitomon forms extensive, nearly pure stands in water or wet soils such as marshes, swamps, and along the shores of streams, canals, ditches, lakes, and ponds. It is restricted to the United States.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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