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Cespitose, 3–9 dm; lvs coarse, flat, 2–4 mm wide; cymes 1–4, compact, the lateral ones peduncled, the branchlets ending in a small glomerule of a few ovoid spikelets 2–4 mm with 1–3 frs; bristles 5–6, antrorsely barbellate, half to three-fourths as long as the achene; achenes brown, broadly obovoid or subrotund, much thickened distally, 1.1–1.5 mm, nearly as wide or slightly wider, transversely ridged; tubercle conic-deltoid, 0.3–0.6 mm. Swamps, bogs, and wet soil. Var. globularis, with few spikelets, seldom over 6 per glomerule, occurs on the coastal plain from Del. to Fla. and Tex., and in Calif. Var. recognita Gale (R. cymosa, misapplied), with dense glomerules, the spikelets numerous and crowded, occurs from N.J. to S.C. and w. through the s. states, also inland from O. to n. Ill. and Mo.; trop. Amer.
