Panicum sect. Hemitonia
Plants perennial; aquatic or semiaquatic, rhizomatous, rhizomes extensive. Culms erect or sprawling, often sterile. Ligules membranous and ciliate, or lacerate. Panicles narrow; branches few, spikelike, erect; ultimate branchlets 1-sided; pedicels less than 2 mm long, appressed. Spikelets lanceoloid, laterally compressed, glabrous; lower florets staminate; upper lemmas thin, flexible, whitish, clasping the paleas only near the base, x = 9.
"decumbent" is not a number."elongated" is not a number.