Panicum verrucosum
Panicum gymnocarpon
warty panicgrass
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.
60-130 cm, thick, glabrous, rooting profusely at the lower nodes;
nodes glabrous, often with a dark green band.
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.
usually shorter than the internodes, glabrous, prominently veined;
ligules 0.5-1.5 mm;
blades 15-40 cm long, 7-25 mm wide, tapering from midlength, flat, both surfaces glabrous, bases subcordate, margins scabrous to smooth, widest at the base, apices acute.
5-30 cm, nearly as wide as long;
branches few, capillary, with a few spikelets distally;
pedicels 0.5-10 mm.
10-40 cm long, 7-20 cm wide, open, with straight, rigid rachises;
branches whorled, stiffly ascending, with short, appressed, higher order branches; ultimate branchlets 1-sided, with solitary spikelets or small clusters of spikelets;
pedicels 0.1-1.5 mm.
1.7-2.2 mm long, about 1 mm wide, ellipsoid or obovoid, glabrous, faintly veined, subacute or obtuse at the apices.
5.5-7 mm long, about 1 mm wide, narrowly lanceoloid, glabrous.
spreading apart at maturity, keeled, prominently veined, scabrous along the midveins;
lower glumes nearly as long as the lower lemmas;
upper glumes and lower lemmas 3-veined, spreading, greatly exceeding the upper florets, lower lemmas longer than the upper glumes, arcuate;
lower florets sterile;
lower paleas thin;
upper florets 1.9-2.2 mm, less than 1/3 as long as the spikelets, obovoid, lustrous, pale to brownish, acute, often short-stipitate.
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.
= 36.
= 40.
Panicum verrucosum
Panicum gymnocarpon
Panicum verrucosum grows primarily in open, moist or wet sandy areas bordering swamps, marshes, or lakes or on roadside ditches; it also grows occasionally in open, drier woodlands. It is restricted to the eastern United States and is mostly, but not exclusively, coastal.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Panicum gymnocarpon grows in swamps, wet woodlands, and the marshy shores of lakes and streams. It is also found occasionally in shallow water, often in the shade. It is restricted to the United States.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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