Panicum verrucosum
Panicum trichoides
warty panicgrass
small-flower panicgrass, tropical 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.
15-100 cm tall, 0.5-1(2) mm thick, sprawling to erect, without cormlike bases, freely branching and rooting from the lower nodes;
nodes prominent, glabrous or pubescent;
internodes not succulent, pilose.
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, rounded, hairs papillose-based;
collars pilose;
ligules 0.2-0.5 mm;
blades 2-7 cm long, 5-20 mm wide, 4-6 times longer than wide, lanceolate, thin, flat, sparsely to densely pilose, hairs papillose-based, bases asymmetrically cordate to subcordate, lower margins ciliate, papillose.
5-30 cm, nearly as wide as long;
branches few, capillary, with a few spikelets distally;
pedicels 0.5-10 mm.
4-24 cm, almost as wide as long, diffuse, partially included or exerted;
primary branches to 10 cm, alternate, ascending to reflexed, branching in the distal 2/3;
pedicels 9-20 mm, threadlike.
1.7-2.2 mm long, about 1 mm wide, ellipsoid or obovoid, glabrous, faintly veined, subacute or obtuse at the apices.
1-1.4 mm long, 0.5-0.6 mm wide, not secund, lanceoloid to narrowly ovoid, plano-convex in side view, sparsely pubescent.
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.
0.4-0.8 mm, 1/3 – 1/2 as long as the spikelets, 1-3-veined, subacute;
upper glumes 0.8-1.2 mm, arising 0.2 mm above the lower glumes, 3-5-veined;
lower florets sterile;
lower lemmas 0.1-0.2 mm longer than the upper glumes, 3-5-veined;
lower paleas 0.5-0.8 mm, hyaline;
upper florets 0.8-1.2 mm long, 0.4-0.6 mm wide, finely rugose, lemmas strongly convex.
= 36.
= 18.
Panicum verrucosum
Panicum trichoides
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 trichoides grows in moist, often weedy fields, woodlands, and savannahs of Mexico, Central and tropical America, and the Caribbean. It has been found, as a weed, in Brownsville and Austin, Texas, and is probably introduced to the Flora region. It has also been introduced into Africa, tropical Asia, and the Pacific islands. In the Flora region, it flowers from August through October.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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