This panic grass
is commonly found growing in wet flatwoods, bogs, swamps and disturbed sites nearly throughout Florida. Panicum rigidulum blooms from summer to fall (Wunderlin, 2003). It has a distinctively rigid, dark reddish inflorescence that
may be spike-like or its branches may be open and ascending-spreading.
Red-top panicum is a grass.
stems robust, erect, smooth, 2-4 ft. tall; leaf blades strongly
ribbed, flat, folded at base, 8-20 in. long, to 1/2 in. wide; sheaths loose;
ligule tiny; inflorescence at stem tip, dark reddish, rigid,
branches pressed to axis or ascending-spreading; spikelets lance-shape, to 1/8
in. long, stalked, tiny hairs at stalk-top